Piston sizes to bore etc how to - Honda ATV Forum
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post #1 of 1 (permalink) Old 02-19-2012, 04:43 PM Thread Starter
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Piston sizes to bore etc how to

I have been asked a lot how to figure out what is needed when a piston is replaced as to which size they need :

Good rule of thumb is ....

so if old piston is 75.5mm
old bore hole was 76mm


bore the hole to 10 thousandths over =.25mm
>>>>>>>>>
new bore hole - 76.25
so... new piston 76.00
new rings .25


HOPE THIS HELPS

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