I'll reduce the timing to 32* and see what happens. Then try octane booster if needed.
The plugs are NGK BKR5E, per NGK's tech support that I spoke with.
I've also tried NGK BKR7E and Autolite 3922 plugs.
Not sure if I'll be able to wait until winter to pull the engine for a new rotating assembly...I'm getting antsy.
Daniel
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