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Old 09-24-2018, 05:36 AM   #10
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Join Date: Oct 2007
Posts: 19,135
Sometimes a "valve problem" is just carbon buildup that keeps it from sealing.

An attempt before disassembly cold be to use a "flit" gun ) a pump sprayer for bugs as use 50 years ago) to spray water into the intake.

This causes steam in the cylinders that loosens carbon quite well. Spray rapidly enough to caise missing , but not stalling at about 1100RPM.

Outboards have a chemical they use that might also work.

Pulling the head for a real top overhaul is of course best , but best done in the off season.
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