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Wrist pin length

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How critical is piston pin length. Does it have to nearly touch the circlips on both side of the pin or can it be a little shorter. I have a oem KX 250 piston and a spare wiseco pin which is about a 1/8th of a inch shorter than oem pins.

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its supposed to fit perfectly between the circlips if i remember correctly. im pretty sure when i put in my second circlip there was no room between it, and the wrist pin

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if there is room for the pin to move, it will. And eventually wear the pins bore, resulting in a loose wrist pin. Thats bad. Make sense?

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