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CB500/550 / Re: top end gasket set recomendations
« Last post by Robert W on May 14, 2024, 06:41:02 PM »I always used a light film of GE Silicone (pure Silcone caulk, not the paintable goop) on the head gasket and the O-rings for the oil passage. It was a poor design relying on the O-ring alone between the head and the cylinders. Why they didn't have a similar setup for the cylinder to crank case with the oil jet is a mystery. However I've got Yoshimura big bore kits with higher compression pistons in both my CB500's and they never leak at the cylinders or the oil passage. You have about a half hour before it starts to set too much so make sure you get the head on and torqued within that period. The silicone also makes for an easier cleanup the next time you change the gasket. Paint thinner or mineral spirits seems to slowly eat the film left behind.