Question about 2003 Yamaha YZ 250

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We need to order a new piston and rings kit for a 2001 yamaha blaster 200. Not sure how the measurements work. Tha calabrator is reading 66.35 on the piston and the jug reads 66.52. so we are not sure what we should order. Anyone have an idea? Thanks

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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

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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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My question is if the piston seized up into the cylinder head do I need to replace the whole head or just buy a top end kit

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You may be able to find a used engine at a reasonable cost from the internet. Google search.

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