Possibly high combustion chamber pressure and shock waves from detonation,or......... Use a 3/8 torque wrench set to inch lbs when installing the plugs. Its amazing how little torque is required. Is the engine running hot with a lean mixture and 87 octane in the tank? The cooling fan/fins maybe anything from oily/dirty to plugged. For the few cents difference on small aircooled engines. I run premium in the chainsaw, snowmobile etc. Detonation/knock is what ruins pistons/cylinder walls in these engines instead of lubrication failure.
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
... [Read Article]
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