4-1
ZHEJIANG KAYO MOTOR CO., LTD.
There are three divided position in cylinder, measure the inner diameter based on X and Y
directions separately.
Limitation: 62.650mm
Count the roundness (X-Y) and deviations (the max value among X or Y the three
positions differences).
Limitation: roundness: greater than 0.05mm, revise or replace.
Deviations: greater than 0.05mm, revise or replace.
Piston disassembly
Block the crankcase and cam chain holes to remove piston pin by a pliers.
Remove piston ring and check if it worn or damaged, clean it. Install piston ring and
measure clearance.
Limitation: top ring: greater than 0.09mm replace
second ring: greater than 0.09mm replace