1. When disassembling the piston, first remove the piston pin retainer, then place the punch in the piston pin hole, one hand against the piston, and the other hand, tap the punch with a hammer, and punch out the piston pin. Lower piston. In some motorcycle engines, the piston pin hole is a transition fit. The piston pin is pushed outwards. The front of the piston must be blocked with a wooden block to prevent the connecting rod from bending.
2, when assembling the piston, select the best piston, first install a piston pin clip spring, then apply the lubricant to the piston pin, gently knock it into the piston hole, and should extend the inner surface of the piston pin hole about 2 mm so that the rest of the gap fits into the small end of the connecting rod. Then, insert the protruding piston pin head into the small hole of the connecting rod, align the piston, and gently tap the piston pin until the circlip groove is fully exposed. Do not use too much force when struck, so as not to damage the previously installed piston pin retainer, and finally install another piston pin retainer.
3. When installing the piston, the opening position of the piston ring must not be aligned with the exhaust port and the scavenging port of the cylinder. Otherwise, damage may be caused by the piston's opening colliding with the exhaust port or scavenge port of the cylinder.
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