This video shows the results from installing a 70cc (68cc) big bore cylinder kit on Project 49, a Chinese 49cc Minarelli / Jog / 1E40QMB powered scooter. The big bore kit is from Autotech355 on eBay. It's a cast iron cylinder. Like other sport level kits, it's very good for everyday street riding. Power increases across the rev range.
The first setup was :
Stock variator & fixed drive face without stock spacer washer
4.5g sliders
Stock rear pulley/torque driver
1,000RPM contra spring
Stock clutch, lightened
Stock clutch springs
The second setup was :
Hoca perfromance variator w/2mm spacers
Modified stock fixed half
6.5g sliders
Stock rear pulley/torque driver
1,000RPM contra spring
Stock clutch, lightened
Stock clutch springs
Main jet remained the same as I used with the stock cylinder (80). I had to lean the idle mixture screw a bit. Needle setting remained the same. Do not assume your jetting won't change. It usually will. Always tune, never assume. I'd suggest upjetting before ever riding. It's safer to be rich than lean.
The big bore engine was much easier to tune, thanks to the wide power increase. To me, the big bore kitted engine is much more fun to ride than the more peaky piped stock engine. Peak power is probably similar to the ported stock cylinder w/pipes, but lower RPM power is not.
Get all of the details at www.49ccScoot.Com and thank you for watching!
#BigBoreKit #70cc #ScooterPerformance
Негізгі бет Автокөліктер мен көлік құралдары Project 49 - 68cc Big Bore Kit - Chinese Two-Stroke Scooter Performance 50cc 70cc
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