Race motors usually have a high port timing which is not what you want in a freestyle setup a stock 760 motor with higher pt is 20 more hp then a 61x but we all run 61x cylinders just saying a race motor may have a ton of hp but not when you want it just my 2cents
Best help she can get is taking those kawis to the dump and buying a sn I recently sold a sn in cali for 800$ Complete those skis aren't worth the effort to fix
What was the compression when you checked? I run 200 psi on 91 with no issues I would agree that you're running extremely lean and that caused the meltdown
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