Question about 2003 Yamaha YZ 250
Take your cylinder to a mechanic and have them measure it. If you're using Weiseco forged pistons you could use a 66.50 but the factory tolorance is .003 so you are right on the edge of needing to have the cylinder re-bored. Weiseco pistons are set for the size of the bore and then they compensate for the tolorances. Don't forget that you will loose a little when you have it honed too.
Posted on Jul 22, 2009
Take the measurement of your block.
having a smaller ring will ensure block not being damaged but prone to a Blow-By. a too-tight ring can get your block damaged. so for you to know which size to get regardless of the stock size, tyr to get the block measurement first, then off you go wich ring to get
Posted on Jul 12, 2009
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Posted on Jan 02, 2017
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