A piston for the 45 cc engine of the Good Luck chainsaw. It creates compression in the cylinder and transmits force to the connecting rod through the pin.
The piston needs to be replaced if there is scoring, cracks, a burnt-through crown, worn ring grooves, or excessive clearance in the cylinder. Signs: loss of power, smoky exhaust, hard starting.
It is best to do the work on a cooled engine with the ignition off, and to tighten the fasteners without overtightening, so as not to strip the thread in the body.
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