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max SAFE compression ratio for XR/CRF

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What is the maximum SAFE compression ratio you can have before you have kickstarter issues? 11:1 or 11.5:1?

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I've encountered kick start issues with a big bore and 10.5. Also after 10.5 you need race gas, the extra compression pressure also hurts very low speed running which can be a problem when riding technical trails.

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