luvmy40 Posted September 20, 2016 Share #1 Posted September 20, 2016 I just noticed the spec for compression on the 83' 1200cc venture is 142 psi -156 psi per the Yamaha service manual. My compression numbers were mostly above those(150-190psi) when the valves were severely out of spec and are all above that(185-190psi) now that the valves are in spec. Is this a typo/mis translation/bad conversion? What are you Other MK1 1 12TK riders seeing for compression numbers? Link to comment Share on other sites More sharing options...
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