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01 drz250 compression ratio??

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My owners manual for my bike has the ratio at 10.5 to 1. I seen on e-bay 02-05 piston replacements and they say the stock ratio for those years are 11.5 to 1. does the 01 have lower ratio or is something up here. Can I upgrade to 02 style if it is true?? Thanks for input.:applause:

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