mike i am running the 64cc heads and i have bought a crane adjustable vacum kit i read in a spot from as a matter of the fact from your pages you showed how to install it but i had no luck with it i tried many ways but anytime i run vacum it would ping real bad compression is at 10.9 do you think that is to much for pump gas i have never before built one with this much compression i dont know much about tunig it used to stock engs. thanks
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