Trouble with my Saito FA-62. Been flying my Hangar 9 Piper J3 Cub for a few years now with a Saito FA-62 four stroke engine. Was running great for a long time. But recently it’s been stalling when the tank gets to be about halfway full, or halfway through a flight. Well, I did a lot of searching online and checking RC Plane Forums such as RC Universe and RC Groups for some advice and I got a few nice viewer comments with some tips (thanks!). The popular advice was that there must be a leak in the fuel line inside the tank that when the fuel drops to half tank, the line draws air which leans the mixture and stalls the engine. This made sense to me. So, I checked the fuel system and replaced all the fuel lines and installed new Dubro tank, but nothing stood out as a problem.
Then I decided to check the glow plug. Based on my evaluation, it appeared that the glow plug was not as powerful as it should be and was worn out. So I replaced it with a new OS Engines Type F glow plug.
Next I set the valve lash or the valve gap of the Saito FA-62B, also known as the tappet adjustment. I use a standard automotive feeler gauge to adjust between the valve stem and the rocker arm. I finish up by placing some Marvel Mystery Oil down the push rods and installing the rocker arm, or valve covers.
Next I did a test run on the Saito FA-62 using VP Powermaster fuel and a Master Airscrew 12-6 propeller. I showed how to adjust the high speed needle and the low speed glow fuel mixture settings for the carburetor and set the RPM for proper idle and up to full throttle.
In this video I take the plane to the field and do some test flights. First, I just did a short flight to see how the new take setup worked, mainly I wanted to see about how long it would take to use up 1/2 of the glow fuel. This way I could gauge about how long I should be flying before I should start looking for that 1/2 tank stall I have been experiencing.
Then on my second flight I kept flying to see if the engine would stall when I got below half tank, and it did! So all the things I did to troubleshoot this problem (see playlist) did solve the issue. But they were still useful things to check.
So then I thought, maybe I'm just flying too slow and the fuel is simply not being pushed back in tank and sloshes forward when low and starves the engine? Well that seems to be the problem. On the third video I show faster flying and the engine ran the whole tank! And I tried this several times again and it appears that I just need to fly a little quicker and avoid slow sluggish flying, especially slow banking, to avoid cut outs. Interesting?
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Негізгі бет Тәжірибелік нұсқаулар және стиль Saito FA-62 RC Glow Engine Troubleshooting Part 6, test flights
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