1. For new motor run-in period is 300km at least. 2. During run-in period, it is prohibited to accelerate throttle handle too fast, you can grip the handle slowly (step by step), or the motor will be locked up. 3. Mixing ratio of fuel and engine oil: 16:1 for new sets, 20:1 after running 500km.
Bore and Stroke: 52mm x 40mm; Better adjusting clutch a little before riding; Excluding manual; 52mm bore; Improved magneto as well
52mm inner diameter of the cylinder; Piston diameter outside is 52mm; Mount studs are 8mm in the front and rear; Intake stud spacing is 40mm in aluminum; Muffler stud spacing is 52mm
It comes as first pictured;YD85CC MOTOR REPLACEMENT PARTS ONLY. piston kit is installed well inside of cylinder already
CDHPOWER YD85cc Motor Replaement Top End Cylinder Set and Bottom End Crank Set for 2 stroke YD85CCï¼›