Do these bikes have a clutch/driveshaft adjustment? Bike seems to run ok maybe lacking a bit of pickup from standstill but the rear wheel locks when pushing it with engine off. Can turn the wheel by hand but it turns engine over(can hear & feel compression). Never used to do it so thought clutch or driveshaft may need attention?
That'll do it. All I know is guys would change the springs on the centrificle clutch to speed up or slow down engagement. Good luck.