Which symptom is MOST noticeable on your dirt bike? Learn how to easily tune the air/fuel screw in just a few minutes: 2 stroke - motocrosshideout.com/carb/ 4 stroke - motocrosshideout.com/fuel/
@stevenkelley7774
7 ай бұрын
2024 YZ85 big wheel starts great hot or cold Right before power band full throttle it coughs bad 1 or 2 times every time hot or cold then goes. Yamaha usually sends them rich. I dropped the needle up to 4 notches and still coughs hasn't changed the cough. 3rd notch drop looked good on the plug medium brownish. They come with a 10 heat range plug I'm wondering if it's too cold having a hard time igniting fuel? Some times in Power band it crackles a little bit with some power loss. Tried air screw from 1/2 turn out to 2 turns still coughs before powerband. Yamaha says 30:1 I run closer to 25:1, older bikes used to run 20:1 Could it be just too cold of a plug having a hard time igniting the mix fuel?
@stevenkelley7774
7 ай бұрын
Also it has fouled 2 plugs in less than 3 hours of riding bike would still run but no power and just sputters and crackles new plug goes back to running descent. The plug check and watching the smoke it doesn't seem rich, it seems close. Could they be fouling from being to cold heat range plug #10 having a hard time burning then overwhelmed with fuel and fouls? After it coughs before power band it usually screams feels good most of the time.
@MotocrossHideout
7 ай бұрын
Changing the plug to a different heat range would just be a band aid fix. If it's not smooth when you hold it WOT, then I would go down one on the main and see what happens. Make sure you have a new spark plug and it's fully warmed up before testing.
@stevenkelley7774
7 ай бұрын
@MotocrossHideout ok my needle is all the way down, when I drop the main size I should put the needle all the way up bottom notch?
@MotocrossHideout
7 ай бұрын
If the needle hasn't made much or any difference, I would put it back in the stock position (middle) and then drop the main down a size or two and see what happens. Have you downloaded my free air screw tuning guide? (Link in description)
@jeffpaxton9172
7 ай бұрын
The sound effex was the best part of the video. 🙂
@MotocrossHideout
7 ай бұрын
Haha, thanks. I hope it wasn't the only good part 😅
@leesops710
7 ай бұрын
It was the effect but you was spot on. Thanks 4 the video very useful.
@jamesc.e.s.4551
4 ай бұрын
They actually were. I thought I was running rich, but because of his "ridiculous" sound effects, I now know I'm running lean. Sometimes acting ridiculous is the best approach.
@goldnugget200
4 ай бұрын
well sounds like my bike is too lean and too rich
@929ivaan
3 ай бұрын
😭😭😭
@jurresein2475
3 ай бұрын
Exactly the Same
@austin41259
3 ай бұрын
Same 😅
@michaeltorske6477
3 ай бұрын
I was thinking the same thing lmao. It is so fun getting that air/fuel ratio just right
@BubbaAngeI
3 ай бұрын
Means it’s running just right😂😂😂
@sambeenen1007
7 ай бұрын
No joke the sound effects helped ❤️
@VadidElab
2 ай бұрын
his sound effect were dead on
@Valentine98766
19 күн бұрын
Frfr
@Johnny2Bags47
18 күн бұрын
Right?!... 💯
@jamesc.e.s.4551
4 ай бұрын
Lol, dude, the sound effects were both r*tarded and completely spot-on. Thanks, I now know I'm running lean, and not rich.
@c4r5on88
7 ай бұрын
Speaking a language only motorcycle owners know and it makes sense
@moboost-nm6ss
5 ай бұрын
Don't ride motocross, but I was seeking information for a motorcycle. Subscribed just for the sound effects because it actually helped a lot 🤣
@MotocrossHideout
5 ай бұрын
Ha, thanks for watching! If you know anyong getting into dirt biking/trail riding, please share!
@bobkelly2447
5 ай бұрын
I'm impressed ! I watched your video more or less just to see what you get WRONG.... but you didn't and for a young guy to have that good of an understanding of the internal combustion machines is amazing ! I've used those aforementioned symptoms to trouble shoot carb issues for over 5 decades .... what will throw you for a loop is having a faulty ignition system that looks like a carb issue ! and that happens all the time. especially with older bikes ! ......so if you've been through the carb several times but the bike is struggling to get power at top end.... suspect that the ignition system is faulty in one way or another. older points systems had the condensers go out all the time but still run...just not run great! newer electronic ignition systems are virtually bullet proof, but they do fail occasionally usually they just stop sparking the plug completely.... but not always and they can be a real Bitch to figure out ! ....you explained hainging idle very well but can be just an idle that is high that takes a while to come down.... My 250 Ninja suffers from this as we speak.... just haven't got around to tweaking the air screws .... I also bought a thumb screw for the air mixture screw for the XR650L that I take to high altitudes every once in a while.... because when set to 4k ASL at 8K ASL it will not re start.... twist the air screw about 1/4 turn and it fires right up ! LOL
@MotocrossHideout
5 ай бұрын
Ha, I appreciate your encouragement, Bob. Thanks for watching and sharing!
@JordonHayden
Ай бұрын
first video out of hundreds that helped me get this
@notyours417
6 ай бұрын
This definitely helped me today. Glad you made the sounds and played short clips of the engine sounds. I got the moto fixed and now we all go BRRAAAPPP!
@MotocrossHideout
6 ай бұрын
Great to hear - thanks for watching!
@notyours417
6 ай бұрын
I am tuning a 1984 Honda ascot vt500ft. The video was easy to understand. Thanks for keeping it simple.
@stlskybob
7 ай бұрын
Thanks for the great video, spot on sound effects!
@MotocrossHideout
7 ай бұрын
Haha, I try! 😂 You're welcome, and thanks for watching, Bob!
@stevodruhy4884
7 ай бұрын
This video helped me sooo so much thank you. Sound effects really helped 😄
@MotocrossHideout
7 ай бұрын
Glad it helped - thanks for watching, Ivan!
@ShakaShinePressureWashing
Ай бұрын
Explained well. A lot I already knew, but good refreshers
@bjornsjoblom3276
Ай бұрын
Awesome video, thanx man 🤘🏻 All 9 signs on too rich fuel were spot on. Now i know where to start.
@gabagool2064
5 ай бұрын
This video was great but I’m still conflicted because my dirt bike has signs of both lean and rich symptoms. 😂
@MotocrossHideout
5 ай бұрын
Ha, well start with the fuel/air screw and do one thing at a time! Let us know how it goes :)
@Poksutin
3 ай бұрын
so well explained and the sound effects really helps :)
@jeffvndeperre1262
4 ай бұрын
carburators are still a learning experience for me and this video helped me allot !
@MotocrossHideout
4 ай бұрын
Glad it helped - thanks for watching!
@fredb-rp1rp
Ай бұрын
Damn good information and the perfect amount of humility. Good teacher .
@D_gas_bob
Ай бұрын
I'm noticing a slight sputter once I reach crazing speed during the summer heat. Give it gas and intakes off, lean the jets some and get rapid backfire.. carbs..
@tehvaris132
3 ай бұрын
the audio sounds were perfect explanation
@andy3d1
8 күн бұрын
I need the running lean ring tone for my phone ;)
@toddj.8245
7 ай бұрын
Loving the sound effects ur spot on !!!!!!!!
@MotocrossHideout
7 ай бұрын
lol, thanks!
@JM-wy6sq
Ай бұрын
Sound effects definitely do help😂
@dulshannuwanga1146
2 ай бұрын
Video is very informative. But best part is sound effects. Love it 😊😁💫
@rob4rmda408
2 ай бұрын
Spot on sounds mate
@scott1brayden2
4 ай бұрын
I've followed your guide, and much appreciated, it's quite addictive aiming for the sweet spot and have helped 2 friends get their pilot set up and running better. For my own bike I have the carb dialled in as good as I can, mainly on feel, taking the bike out for a good run. But I've gone up on main jet and it pulls so much better mid but now it seems not to rev out as much at top. Maybe over thinking this, but can running too rich improve mid range at expense of top end, evrything I'm.rrading is saying rich improves top end.
@MotocrossHideout
4 ай бұрын
Thanks for sharing Scott - I'm glad you found my guide helpful! That's a good question. From my experience, you shouldn't have to sacrifice top-end for midrange torque based on jetting. I like to lean out the main jet for top-end/peak HP until it starts losing power or bogs and then go back up (richer) 1 or 2 sizes.
@johnwojcik977
4 ай бұрын
On a 2 stroke rich will be torquey and splooge out of the tail pipe, lean it'll run like a scalded dog right up until it melts.
@KUBBI7488
4 ай бұрын
Great video! Sounds effect very helpful!
@uniauto2318
3 ай бұрын
really helpful, thx bro.
@MotocrossHideout
3 ай бұрын
Glad it helped - thanks for watching.
@veteransowhat5669
3 ай бұрын
Running the vehicle to lean will ruin the engine, running too rich will cause a bog down. A mix ratio should be determined by math, color of fuel and the sound of the bike. Use a jar, or a clear water bottle a quart 4 quarts make up a gallon so the ratio of oil will change accordingly. ÷ by 4 for the oil mixture. 40:1 is a cap of oil for a quart and is 36/38:1 the actual % is 0.8 so slightly under a cap if the cap is equal to 1.0. Running the bike with a lean mix will ruin the bike. Do not let or allow any person to put fuel in the bike.
@highontowers
3 ай бұрын
awesome vid. Very instructibe.
@cfransua7691
2 ай бұрын
Yeah I got to agree with the guys comment below my comment , I have the same problem as him it sounds like my bike is running too lean and too Rich
@ogbigtsbikesandstuff887
3 ай бұрын
I have an 86 Yamaha Jog that has always been tough to tune (too lean). Think I'll check for new air leaks. Thanks ✌️
@dalehess6265
7 ай бұрын
Thanks for the awesome information.
@MotocrossHideout
7 ай бұрын
You're welcome, thanks for watching, Dale!
@eChuckNorris
Ай бұрын
When in doubt, run more rich as a pose to more lean. Don't melt a piston like I did.
@MotocrossHideout
Ай бұрын
Yes, but rich can cause a host of other problems, such as: fouling plugs, hard starting when hot, poor throttle response, and carbon buildup, which can potentially cause an engine failure over time if it builds up too much. That's why learning to jet your carb is so important. For casual trail riders, just learning how to tune the air/fuel screw and pilot jet can make a huge difference, and it usually doesn't take long.
@bennyrogergundersen3040
3 ай бұрын
Mine had problems giving throttle, turned out the oil pump had stopped working, so I am mixing oil directly in the fuel now.
@drunkredninja
3 ай бұрын
i appreciate the noises
@hooligan6855
4 ай бұрын
It's crazy how I'm having rich and lean issues lol
@basimfara
4 ай бұрын
I like your examples 😂. If you have a video for selecting main & slow jets to solve rich or leen I would watch. Thanks for sharing
@MotocrossHideout
4 ай бұрын
Thanks! Here's a video on knowing if your pilot jet is rich or lean: kzitem.info/news/bejne/xbB84It_k6Wmd5w
@alant383
2 ай бұрын
Thanks, but there's no fuel screw to richen mixture on this carb. The only ways are to change jets or just raise the needle on the slider one notch.
@evansmith396
27 күн бұрын
I’ve got a bike that runs fine down low but full throttle high load it has no power and doesn’t accelerate. Ive cleaned the filter changed to new plugs and cleaned the carb,( I may need to clean the carb again). This bike has ran great all summer so I’m not sure what’s going wrong now. The bike usually has crisp throttle response off idle but some times on snappy throttle twists it stumbles at first.
@MotocrossHideout
26 күн бұрын
Hey Evan, does it happen more on hotter/high humidity days? It sounds like it might be running rich (if it's sputtering), which is typical on hotter days. If the compression is good, you might need to go smaller on the main jet (if it sputters at WOT). Let us know what you find out, as well as the bike you're tuning :)
@congo979
3 күн бұрын
I have both symptoms… i can start without choke easy but when i accelerate then it boha down and after bog its have power asf … i have beta rr 450 2006
@MotocrossHideout
3 күн бұрын
Hmm, sounds like the fuel screw might need to be leaned out, and then the accelerator pump might not be working properly.
@pramodverma9700
7 ай бұрын
Excillent explanation
@MotocrossHideout
7 ай бұрын
Glad you think so!
@alant383
2 ай бұрын
Is it too lean when it pops and crackles when you back off the throttle eg going downhill at higher rpm??
@MotocrossHideout
2 ай бұрын
Yes. A little bit of popping is okay, but a lot of loud popping and banging is excessively lean. Trying richening the fuel screw and see what happens.
@jizzmondo7
3 ай бұрын
Great video! It really helped Thanks!
@MotocrossHideout
3 ай бұрын
Glad to hear it!
@filipherzog2820
Ай бұрын
Thank you, now I know why my peak is on 20% of throttle 😂
@mikedahoe2251
4 ай бұрын
Needed this, thanx dude!
@MotocrossHideout
4 ай бұрын
Happy to help!
@aspect6693
4 ай бұрын
I have a 2 stroke 73cc aluminium kit. and its smoking a lot on wot, but I cant understand why because it's lean. the spark is brown but more on the lean side. I was running 122 main jet, after that, I installed 115 and it was SUPER LEAN and it still made a cloud of blue smoke. Now I'm running a 118 main and its still smoking. I have tried everything, like taking of power jet, different oil, other gasoline, different air temperatures, spark plugs, different oil mixtures, changing needles, needle clips, different carb positions and a lot more.
@MotocrossHideout
3 ай бұрын
Is it liquid or air-cooled? How is the throttle response and power when you hold it wide open? Does it rev out smoothly and clean with a 122 main?
@aspect6693
3 ай бұрын
It's liquid-cooled. At the moment I have a 24mm carb and it idles a lot better but still smoking on WOT but a lot less. It acts lean but still smoking. The headgasket is not leaking and the gearbox oil level is normal. And does not smell like gasoline
@aspect6693
2 ай бұрын
?
@georgelaw92
23 күн бұрын
I have a question what if i do fulll throttle and it bogs then dies i also tried to adjust idle screw multiple times
@NateDS13
15 күн бұрын
Does this apply to fuel injected engines?
@philhitch1924
4 ай бұрын
If it's a 4stroke and blows white smoke it's a problem with oil in the combustion . Not good. Engine worn out. Brown or black smoke is unburned fuel. A mixture problem .
@recklessfreedom
5 ай бұрын
Great video!!
@xavaarea6ty126
2 ай бұрын
i will have it in neutral and rev it for a bit but i go wide open throttle n sometimes itll bog for a second
@MotocrossHideout
2 ай бұрын
It could be a little lean on the main jet. Hard to know for sure without more info/sound.
@jaredradison8372
Ай бұрын
Bike doesnt need choke to electric start and fires within the first 2 cranks. Bogs hard when i pin the throttle but i can roll in and have good throttle response. I dont get any sputter or hanging idle. It gives me lean and rich symptoms
@MotocrossHideout
Ай бұрын
Hard to diagnose without more info. What bike? Is engine fully warmed up? What throttle position does each symptom happen? Has it always done this or has it gotten worse?
@jaredradison8372
Ай бұрын
@MotocrossHideout yamaha ttr-230. Moved the bike from sea level to about 7000. Jetted Down from a 117 to a 106. If I pull the scree almost all the way out it runs better with a huge bog on initial throttle but will pick up. Today I moved up to a 110 and was able to put the screw in about half way. Still a bog in the start with both engine cold and hot. I've been chasing it for about a year now
@MotocrossHideout
Ай бұрын
Okay, first you need to get the fuel screw properly tuned. The fuel screw is on the bottom of the carb in front of the float bowl. It controls 0-1/4 throttle position. That will tell you if the pilot jet is too big, small, or just right. Then the main jet controls roughly 3/4 to wide open throttle position. Always make one change at a time and only when the engine is fully warmed up.
@MotocrossHideout
Ай бұрын
@@jaredradison8372 Okay, always make one change at a time. Get the fuel screw/pilot sorted first - that's from idle to 1/4 turn throttle position. If it's bogging (engine dying) at WOT, the main jet is probably too lean/small still. Don't make changes if the engine is cold/not fully warmed up.
@HalDanakaAlex
4 ай бұрын
Thanks, it seems like my bike is too rich in mid range and ok on near cut off
@systematic_control367
Ай бұрын
Yup I’m running rich. Stupid thing is my needle clip is set to manual settings for a 85’ 125yz. Stupid manual. I suppose different carbs probably affect this as well? My $50 Amazon carb runs best but my $275 brand new Makuni won’t even let the bike idol?
@MotocrossHideout
Ай бұрын
Carbs do wear out. For example, the needle moves up and down every time you turn the throttle. There's a chance that the spot that rubs on the needle has worn down and a new needle might help.
@benjocrostar
2 ай бұрын
Dang it my 50cc starting on first kick in the winter at -7 celsius😂
@alanwade2962
28 күн бұрын
Fantastic video...thank you!
@vijayam1
2 ай бұрын
Brilliant..
@reasonator47
2 ай бұрын
Great video, man! If so unexperienced guy like me could get it then it tells something. Thank you! :)
@MartyGramRC
5 ай бұрын
Phenomenal - thank you
@MotocrossHideout
5 ай бұрын
You're welcome, thanks for watching, Marty!
@Tc_85_kid
2 ай бұрын
Hey I know im a bit late but just wondering why the bike will hit the limiter if to rich becasue my 85 does that. Should i go smaller on the main jet?
@gumbilitous2804
4 ай бұрын
My quad (250 4 stroke) struggles at low rpm and high load, and it really picks up power above like 4k rpm
@MotocrossHideout
4 ай бұрын
Does it sound/feel lean or rich based on this video?
@loganroseman
2 ай бұрын
I have a crf150r that idle hangs when hot but also won’t kickstart when hot I don’t know what to do I don’t have very much experience
@MotocrossHideout
2 ай бұрын
Could be an air leak or valves need to be adjusted.
@AntonioB175
3 ай бұрын
It sounds like my bike is running rich I have a 4 stroke and my bike doesn’t start with the choke on
@JamiePymm
11 күн бұрын
Hiya I've got a crf 250 when I pull a way it is making a funny scrapping noise but when I pulled the clutch in it stopped ,,can you please help me
@MotocrossHideout
11 күн бұрын
Hard to know without more info. The the chain and sprockets straight and in good condition with proper tension? If everything external is good on the bike, then I might want to pop the clutch cover off to make sure nothing is loose or broken. Let us know what you find!
@ndyales2226
4 ай бұрын
hey guys, i need help, i was riding completely fine and when i stopped it stalled. I kickstarted it and it was stalling when i didnt put a lil bit of throttle. So i quickly went home and when i was dricing home i figured out that my gas is bad. When I held the throttle for a while and then let it go, it held on for a while. When I just moved the throttle, the throttle stayed for another 0.3 seconds, which didn't happen before.
@AlexanderFountain-j2k
3 күн бұрын
What if it’s bogging but my spark plug is black
@MotocrossHideout
3 күн бұрын
If the plug is black, that's usually the pilot jet circuit that's way too rich, which could be caused by jetting, dirty air filter, low compression, etc. Start with one thing at a time :)
@sethjensen54
2 ай бұрын
What is the difference between a lean bog and a rich hesitation?
@MotocrossHideout
2 ай бұрын
kzitem.info/news/bejne/tm-w4Kigampnm2k
@donnieji4825
5 ай бұрын
What happens when i cant stop make these sounds with my mouth when I'm not on my bike?
@MotocrossHideout
5 ай бұрын
Is that a problem? ;)
@michaelmwangi7477
4 ай бұрын
my bike goes brrrrrrrrrrrngg brrrrrrrrrrrrng
@justinlloyd9342
7 ай бұрын
I’ve got a 4 stroke that I would say is running a little rich. But my biggest issue is flame outs or stalls. I’ve only ever rode 2 strokes and I’m wondering how to fix it
@justinlloyd9342
7 ай бұрын
Bike is a ssr300 the stock carb was junk so I put a lectron on it and it improved it 100% but I still have the flame outs thanks for the help
@MotocrossHideout
7 ай бұрын
Hey Justin, flame outs are often caused by lean pilot circuit jetting or a light flywheel weight. Can't remember if the lectron has a fuel screw, but I would richen that and see if it helps (always test when the engine is fully warmed up).
@justinlloyd9342
7 ай бұрын
@@MotocrossHideout I would adjust it but it has some of the signs of running rich like fuel smoke while idling and giving it gas but I’ll do some adjusting on it and see what happens thanks for the help
@walkertongdee
2 ай бұрын
Cool sound effects lol...
@lucaz-if2hq
4 ай бұрын
my 4 stroke especially in first gear likes to jump like cut in n out when i get on the gas and when i hold it like half throttle it just sounds horrible
@MotocrossHideout
4 ай бұрын
Sounds like it needs some tuning - what have you tried so far?
@Kpostma100
4 ай бұрын
My 4 stroke 250cc quad does frive alright has alot of power but when decelerating i hear alot of pops from the exhaust,i thought that might be becouse of a to rich mixture but i have no problems or signs whatsoever
@MotocrossHideout
4 ай бұрын
A little bit of popping/crackling is fine, but excessive/loud popping generally means the fuel screw/pilot jet is too lean.
@xxs1lentk1ller30
4 ай бұрын
Hey, i have a little problem with my 6mth bike, starts hard on choke and dies when warm dies when rapid gas, lowered gas amount still same problem
@MotocrossHideout
4 ай бұрын
Not sure what bike that is but have you tried adjusting the air/fuel screw or the idle screw?
@tungtumlum
3 ай бұрын
I really dont understand unless mouth sound effect 😅
@johnmathewson985
5 ай бұрын
1980 PE 175 2 stroke. When starting it takes 6 -8 kicks with choke on. When it starts it will rev high for many seconds. It is like my kicks are filling up the the engine with fuel then it starts. When I stop the bike I will turn off the gas and run the fuel bowl empty. I am familiar with jetting and the float level has been set. Any thoughts?
@MotocrossHideout
5 ай бұрын
Revving high right away is typically a lean symptom. Either not enough fuel or there's an air leak around the carb/intake. Check for loose clamps or cracked manifold, then move to jetting. Let us know what you find.
@mysticalmisfit33
4 ай бұрын
I signed up trying to get the tuning tips and didn’t receive it. Got an email about trail riding.
@MotocrossHideout
4 ай бұрын
You should have received it within a few minutes of signing up. Check your spam folder in case it went there. If it's not there, just reply to one of my emails and I'll personally send you the guide. -Kelley
@kylejohnson9510
2 ай бұрын
Mines running at full throttle only😂
@jamalmitchell6223
4 ай бұрын
I think my 08 crf150r is running to lean it keeps overheating what should i live in Cincinnati Ohio if that helps thanks
@MotocrossHideout
4 ай бұрын
kzitem.info/news/bejne/tWOIk5iXnJ55a34
@betillgettop3tv352
4 ай бұрын
What’s your recommendation when you have symptoms for both rich and lean? My bike is getting super hot in a very short amount of time (before actually riding). It starts really easy when cold with or without choke and revs really high until bike warms up and then the revs die down and even out. I’ve just rebuilt the top end after the motor got that hot the piston seized the inside of the barrel. After about 10 minutes of riding.
@djbanton-bikes
2 ай бұрын
Sounds like you are rich on pilot jet and lean on main jet
@steveabner
4 ай бұрын
I have a DR350SE with a tm33 pumper carb. At idle, it has a bog when quickly snapping the throttle, and I can't figure it out. I've tried changing jets and would always end up too rich, and I've checked the pumper needle multiple times.I even went as far as installing a wideband O2 sensor in the exhaust. The tm33 pumper carbs don't have adjustments on the pumper, it's just a rod. The bike runs great other than that, I've been trail riding with it for a year. If anyone has any ideas, I'd be willing to try them. 😊
@MotocrossHideout
4 ай бұрын
What throttle position when you quickly open it? If it's wide open, then I would try adjusting the main jet size to see if it helps.
@steveabner
4 ай бұрын
@@MotocrossHideout It's when the throttle is closed and I quickly open to wide open it will bog. Which is lean, I think. I've gone up a main jet and it spits and sputters at 3/4 - full throttle and the wideband gauge is pegged in the 10s full rich. So I changed it back. I've heard it's hard to dial these pumper carbs in on a dr350.
@GregDavidson-si8kt
5 ай бұрын
What grade of gas should be run through a crf150rb? Is it ok to run premium gas through it? That's all I put in my lawn equipment and vehicles.
@MotocrossHideout
5 ай бұрын
Yes, if your 150R is stock, 91-93 premium is fine to use.
@danielluhan8794
5 ай бұрын
use non erhanol if available😊
@MotocrossHideout
5 ай бұрын
Yep, ethanol is not good in any machine (especially a carburetor) if you want it to last more than a few weeks.
@GregDavidson-si8kt
5 ай бұрын
@MotocrossHideout gotcha! Thank you for all that you do! I have so much more confidence and a much better rider in just a week's time by watching and paying attention to all your lessons and advice. I don't want to find myself overly confident and always maintain a respect for the machine. I am so in love with my bike! I'm going to always be good to her, and she'll always be good to me.
@rdowg
3 ай бұрын
Quick question: So if my bike needs the idle adjustment screwed in ALL the way, that means the carbs need adjustment?
@MotocrossHideout
3 ай бұрын
That's definitely one symptom. That usually means it's running rich, which could just be the jetting, but it could be a very dirty air filter or perhaps a worn out engine that's running low on compression.
@rdowg
3 ай бұрын
@@MotocrossHideout would it feeling like it's "chugging" on idle in 1st gear tie in with it being "too rich"? Im praying it's not a worn engine, I made sure the carb and air filtration system was perfect before I put the carb back in. It's a 96' vulcan750, and I got it with the carb detatched because my dude rebuilt it but couldnt figure out how to put it back in
@MotocrossHideout
3 ай бұрын
@@rdowg It's hard to know for sure without seeing/hearing it. To me, "chugging" would be riding at too low of an RPM and the engine is about to stall.
@rdowg
3 ай бұрын
@@MotocrossHideout Crap, oh well 🤷♂️ Now that I think of it, I should probably re-tune that carb before I start asking about idle on 1st feeling like it's got too low rpm Thanks for the replies!
@gagelemoine118
6 ай бұрын
my bike is muttering when i get in 5th and run it wide open what do i do to fix it?
@MotocrossHideout
5 ай бұрын
Hey Gage, what exactly do you mean "muttering". What does it sound/feel like?
@KokohG4UL
4 ай бұрын
Mate I need some help, my bike starts just fine with one kick in lower elevation, but in higher elevation it can't do that anymore, It's hard to start, when I check the plugs, the color of it is grayish (I checked it in lower elevation), what seems to be the problem here mate? It seems that the RPM runs too low in higher elevation that's why It doesn't start easily, but if I bring it up, the idle in lower elevation would be too high
@MotocrossHideout
4 ай бұрын
Good question - that's a very common problem with carbureted bikes when changing elevation. When you go higher, the air is less dense and it will make your bike run richer, so you'll need to lean the jetting out at a higher elevation, and then richen it back at lower elevation. Start with the air/fuel screw. Does that make sense?
@kurtfredericks.sinlao8589
6 ай бұрын
Mine is bogging while sudden accelerating like you have said. But when i check the sparkplug the of it is black. Hope this will have answer. Thank you
@MotocrossHideout
6 ай бұрын
Yeah, that's why spark plug reading isn't always accurate. Does it bog when you turn the throttle wide open? That could be lean on the main jet, while the black plug is caused by rich on the pilot jet.
@kurtfredericks.sinlao8589
6 ай бұрын
@@MotocrossHideout it is bogging when i turn the at full throttle. The bike is not moving the engine is like its going turn off. But when i am on drive. Just like your example on number 6(bog while accelerating)
@MotocrossHideout
6 ай бұрын
Yeah that sounds to me like a lean main jet (too small). I'd go one or two sizes bigger and see what it does. Not sure what bike it is, but some bikes also don't respond as well when you "whack" the throttle open, especially if it has an older carb without an accelerator pump.
@kurtfredericks.sinlao8589
6 ай бұрын
@@MotocrossHideout ok i try changing my jets into bigger one. I am currently using 125cc motorcycle with a 28mm carb jettings are 100 and 38.thank you
@bikingwithjack4276
4 ай бұрын
I have every single symptom 😂
@DallasWelch-o4s
5 ай бұрын
My yz85 fouls plugs every ride I have an fmf shorty on it with I think rich jetting from the guy I got it from and I ordered stock and a size down for each Jett. Does that seem reasonable?
@MotocrossHideout
5 ай бұрын
Yeah, stock is a good starting point, but they often tune the race bikes a little on the rich side from the factory. Start with the air screw - grab my Free guide if you haven't already;)
@Wesley..
4 ай бұрын
Great vidoe man but i still can't figure out whats wrong with mine. I have a Crf250X, it starts like it should. When i give it some throttle the rpm stays high and wont settle to normal. When i pull the choke out and back in it goes down to normal. But again when i throttle it stays high. When im in gear i can let the rmp go down by pulling up with only the clutch. If the bike stalls of I want to start it when it's warm, it won't start and eventually drags the battery empty. I played with the air mixture screw and stationary idle screw but I can't figure it out 😬Maybe I did something wrong. Could there also be something wrong with the throttle body you think, like scratches or false air?
@MotocrossHideout
4 ай бұрын
That sounds like a hanging idle, which is a lean condition, usually caused by the fuel screw/pilot jet being too lean or an air leak. Make sure the carb clamps are tight, there's no cracks in the intake/air boot, and that the fuel screw has the proper o-ring/washer on it so no air is leaking by. If it's always done this, then I'm guessing you just need to richen it up. If it's a new problem, the pilot jet might be dirty and need to be cleaned or replaced - assuming there are no air leaks. Let us know what you find, Wesley!
@Robochris
6 ай бұрын
So I kind of have symptoms of both. Easy start. Bogs and dies with throttle. Hanging idle. Poor throttle response. What should I be looking at next? It’s a 90cc 2 stroke atv. Kids were riding fine one day and just started acting up, hasn’t been the same since. Carb rebuilt, new jets and all. Also has new oil pump.
@MotocrossHideout
6 ай бұрын
Sounds like it might be lean. Have you tried adjusting the air screw? Also, make sure the carb clamps are on and tight so there's no air leaks.
@Robochris
6 ай бұрын
@@MotocrossHideout so far I haven’t found any air leaks. Seems to idle best with air screw around 1 turn out but still bogs out with throttle. Any idea what could cause it mid-ride?
@MotocrossHideout
6 ай бұрын
What throttle position is it at when it bogs? 1/8, 1/4, 1/2, or full?
@Robochris
6 ай бұрын
@@MotocrossHideout so, its mostly 0-1/4, almost immediately. when I can get it to rev, I can tell its cant go full throttle. top end rebuild kits are fairly inexpensive on these, could that solve it?
@MotocrossHideout
6 ай бұрын
Okay, I'd try going one size larger on the pilot jet and then re-adjust the air screw for best throttle response and see what happens.
@justspooky6184
5 ай бұрын
Hey my bike backfires and shoots a flame about every 7 seconds when i accelerate, its fine and feels good untill about 60% throttle then it starts to happen. It also bogs at super low rpm if i just rip the throttle. Any tips/ideas ?
@MotocrossHideout
5 ай бұрын
What have you tried so far? I recommend grabbing my free fuel screw tuning guide and starting there if you haven't yet ;)
@ultronpym1008
7 ай бұрын
I have a klx140 with bore up kit 66mm, cam lift, exhaust. it runs great at 3/4 to full throttle but in technical slow section specially rocky section its like its coughing/sputtering i'm using 28mm carb with 38/120 jet 1st clip on neddle. is the pilot jet too rich? it gets worsen if I pull the choke from 0-1/4 throttle.,by the way usually running at 200-800 ft.
@MotocrossHideout
7 ай бұрын
That sounds rich to me. Not sure which 28mm carb you're using, but have you tried leaning out the air/fuel screw? Grab my free guide to learn how to do it in just a few minutes to know if your pilot jet is too big.
@quantumtechcrypto7080
5 ай бұрын
There is a map that shows the overlap of different systems in the carb. Find that and specifically dial in the area that’s affected. I found out when you understand the concept of the systems they each have to work well for that smooth linear operation ir you get what you have. Sounds rich too. Could be needle size and placement as well as air fuel. Is screw before body of carb is adjusts fuel is after main body (float bowl) and it’s closer to cylinder head it adjusts air. Look for that breaks it all down. I think it the RD jet kids or??
@TheWhole36
5 ай бұрын
My bike won’t start with the choke on but will start fine without can you help
@TheWhole36
5 ай бұрын
What jet do I need to change and would I have to go up or down
@MotocrossHideout
5 ай бұрын
When the engine is cold (air temp)? Sounds like it's runing rich. Have you tried adjusting the air/fuel screw?
@paulofaria976
4 ай бұрын
My Ktm 300 exc starts on the first try every time but runs like ass, why?
@MotocrossHideout
4 ай бұрын
What does it do when riding?
@6Twisted
4 ай бұрын
Rich engines run cooler because producing carbon monoxide produces significantly less heat than carbon dioxide.
@endurofan9854
3 ай бұрын
but the toxicity was really bad tho
@shaybelfield1006
6 ай бұрын
I have a yz 85 bored to 105cc used the same jets and was fine,then I installed vforce4 reeds and rebuilt the carb with the same size jets but new ones, now the bike doesn’t want to start from cold with or without the choke without giving some throttle, even when engine is warm it won’t start without throttle and when I give it some revs and let off,the engine wants to cut out, also turning the idle screw doesn’t seem to change the revs, and has a minor bog from 0-1/4 throttle but once hitting the bands it runs fine, any idea what this could be?
@MotocrossHideout
6 ай бұрын
Sounds like it might be rich on the pilot jet circuit. Have you tried leaning out the air screw? I recommend grabbing my free tuning guide :)
@shaybelfield1006
6 ай бұрын
@@MotocrossHideoutyes the air screw didn’t seem to make a difference so I’m going to try a smaller pilot jet and see if it’s better or worse thank you, I wasn’t sure if it’s too lean or rich
@shaybelfield1006
6 ай бұрын
@@MotocrossHideoutI’m using 45 pilot and 138 currently which are stock with yz 85
@huntnfishin2074
7 ай бұрын
What’s a symptom of 250f feeling slow in top gear? Was riding with my buddy who has a 450 and felt like I was topping out at like 50mph. Possibly the sprockets? It is a used bike. Seems to have plenty of power was just suprised thought the top speed would be more
@huntnfishin2074
7 ай бұрын
It has a power commander. After watching more of your video that is a better explanation it seems like it also gets rev limiter fast! In 5th gear
@MotocrossHideout
7 ай бұрын
What bike? What gearing/sprockets does it have?
@huntnfishin2074
7 ай бұрын
@@MotocrossHideout I’ll have to count the teeth, some are broken off need new ones. It’s an rmz250
@MotocrossHideout
7 ай бұрын
@huntnfishin2074 teeth broken?? Get new sprockets and a chain and then see what happens.
@vincentdyas4063
7 ай бұрын
What if it’s doing both
@MotocrossHideout
7 ай бұрын
Hey Vincent, could you explain to us exactly what you're hearing/feeling and what you're doing on the bike when it happens?
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