Pinging B$@&%@rd 440!

mopower440 said

But if the compression turns out to be the issue with the current 88cc heads, how could i run the eddy 84cc without it being worse? Not being smart, truly asking because i dont know, unless the chamber being closed on the eddy makes for a better chamber to stop detonation?

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You don’t have a compression issue. You have a tuning issue.

That should run EASILY on 91. Probably less.

You have a horrible plug location. You have an even worse selection of spark plugs with those heads.

Slow the curve down through the middle.

You may need to go up in jet some to cover it up.

And I’d raise your coolant temperature to 180. You don’t have enough cylinder pressure to run the engine that cold.

You may be running into detonation because the engine is too cold and the fuel isn’t vaporized.