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Message: [QUOTE="Strick, post: 140423, member: 16681"] There in lies the partial answer Rich. To my knowledge KTM does NOT post compression ratios in their marketing materials, or their manuals. I do have an engine manual at home that I will also check. So, other than the do it youself measurement, and the type of compression 'ratio' you are trying to achieve, the only quick and easy down and dirty measure that the KTM owner has is a compression test (PSI). The 2-stroke variations that Marcus mentioned is probably why KTM declines to provide any measure. So KLXsmoker, you slam me because I provide the only measure of compression that I have access to on one of the specific bikes in question, and then you provide a 4-stroke answer to a 2-stroke question. O.K.:silly: I will post back whether or not the KTM engine service manual listl the Compression ratio. I am fairly certain that 'vanilla' owners manual/guide doesn't have the info. [/QUOTE]