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need help with 4 mill crank setup banshee


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I have yamaha banshee 1996 it has a hot rod 4 mill crank with wiseco 513MO6550 prolite piston.It has a ADA Racing 21cc Domes cut 2 mills and no spacer plate under jugs. Jugs are stock ported It is running about 190 psi in each. the squist in ea. is .048. What can I do to bring down the compression to run pump gas? thank you George F.

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Contact ADA and see if you can get new un-cut domes, that would be the best thing to do. You could call Cometic gasket and have them make you some base gaskets that are 2mm thicker than stock, but that would throw your port timing off quite a bit and might make it run like crap.

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