more pickup and top speed
when hi rev
gear 1st:80kmh
2st: 130kmh
3st:160kmh
4st:1**kmh
sprocket size standard..
hehehe i put bearing at crankshaft only n engine running soft..also chance(ride it )racing cam n spring..
btw my milleage 39000km..i overhaul the engine becoz piston rod problem..