Originally Posted by
Popa Sam
I would not use surface gap plugs until the cooling problem is corrected. The center electrode usually ends up in the combustion chamber instead of in the plug body. Don't know why you chose the lost foam block instead of permanent cast one. The lost foam does not hold shape as well as the permanent. Also the permanent has better cylinder sleeve support and higher crankcase pressure. There are several versions of the lost foam. Depending on which one you are using it may be dumping too much water from the bottom causing lack of water pressure at top. Do you monitor water temp, water pressure and CHT ? That would help you find problem and stop before damage occurs. Good luck.
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