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04 CR250 I'm looking on eBay for a piston kit and I'm wondering how can 3 different size pistons fit a standard bore? Some say 66.34 standard, 66.35 std. Bore, and 66.36 ? My cylinder says A on the side does this make a difference because I also see A, B, and C kits. Need help quick all my local shop said was that my cylinder is plated and stander bore?

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Head over to a harbor freight and get the tools to measure your bore and your current piston.  It'll cost less than $20 for the 2 tools.

Compare it with the service limits in the manual before your order anything!

But yea A piston goes with A cylinder unless your bore is worn.  

Stick with OEM Honda piston if you can. 

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