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Posted

The head is milled down an unknown amount. The left side piston has a ring mark in the carbon buildup, maybe from the dome? The head looks fine but the spark plug on that side keeps backing out. I've tried 222 loctite with same results. Starts and runs great,I'm getting some roughness around the edge of the pistons.i probably just need to run higher than 91 to get rid of detonation.

Posted

Well it was at the dunes and I needed something to work for the time being with the loctite. The compression is around 170.

Ditch the head honestly. And 99% of the time that requires race fuel.
Posted

Sounds like deto. I would tear into it and have your crank gone over by someone reputable. Get another head (depending on your budget) a cool head or an uncut stocker. May as well freshen up the top end while you're there.

Posted

I appreciate the help guys. This is my first banshee. I've only had Hondas before this. I'll get a cool head and start running 100LL AVGAS. Will that need a different plug?

No, same plug.
Posted

Chances are it's not angle milled so look into an air leak on that side also before teardown . 100 octane will be fine as long as your squish is above .045

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