Replacing wrist pin bearing
I have been riding for 40 years, replacing the wrist pin bearing, along with the wrist pin, clips, rings and gaskets was always done when the top end was serviced. The possible damage from not doing so is not worth risking the small savings. Racing highly strung 100cc aircooled MX bikes in the early 70's
probably had something to do with it.
Trailrider
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