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Old 04-27-2014, 01:52 PM
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Join Date: Mar 2010
Location: Central Texas
Posts: 5,379
Default Re: Bought bottom end from Boy Go Fast, should I be worried?

Originally Posted by fischer550 View Post
So guys, is it ok for me to run a milled slant head on a 40mm stroke as long as the piston does not hit the head or plug? (it doesn't) That's all I want to know.
Yes it is fine to run the milled slant head with a stock head gasket and as long as the slant head has not been milled beyond the height of the raised sealing ring that the heads have, it is a good idea to leave the spark plug out and roll the bike forward or backwards with clutch engaged so the engine will spin over just to make sure the piston doesn't contact the head.

I have shaved the slant heads down until all of the sealing ridge ring is removed and as long as the head gasket is a stock thickness of 0.018+ I have never had the piston contact the head.

I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!
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