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Milling the head on a 650

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Discussion Starter • #1 •
I would like to raise compression to 170ish...

Is the rule 10 psi increase for every tenthousandth of an inch milled?

What is factory compression (in psi) on a 1990 650 Superjet?

Lastly, is this even a good idea to do if everything else on the ski is stock (meaning it is the first mod besides k&n air filter)?

Thanks
 
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