(ENG) 4FUN MOTOR SPORT PIT BIKE - DIRT BIKE CLOSE RATIO GEARBOX - Track test HD

For all our products please visit http://4funmotorsport.com In this video we will show you the new racing close gearbox for pit bike and dirt bike. You can install it on YX engine series from 125 to 160, Zonghsen from 125 to 155 and lifan 125 - 160. Also in Honda Nice CT based Monkey Bike crankcase is possible to install it useing the OEM drum shifter. This part is developed for Italian high skill level racer and you can use the second gear in place of third The 2th is long as oem chinese 3th ( a little less), the 3th and 4th are close for better engine performaces. This will help you to have always a perfect engine revs in short corners, a good advance with 3th and close 4th for reach best speed possible in straight line. Tested race gearbox on Italian little go kart circuit, used by us for training. Other race traks are more long and fast, suitable for SX world championship. during test we used chinese pit bike, zongshen engine with 4Fun Motorsport race high compression piston and race 300 degrees camshaft