Hello Scott
"found a corroded exhaust seat"
I read your post with interest.
First off you speak of corrosion and corroded exhaust seat.
Is it perhaps "Erosion" as in burning it up in use?
How is the ignition timing? Retarded or whacked?
See:
http://www.greenskyadventures.com/engineservice/TechTips/912Ignition/912IgnDiagrahm.htm
You are absolute sure only proper fuel got into plane?
No jet fuel or some with way too much alcohol or a wise guy pouring in
some model aeroplane fuel with lots of alcohol and nitro?
Is the carburetor too lean?
Are you running float bowl vents to static pressure air, not to an area of
lower pressure like somewhere in the cowl that is low pressure? The carb
float bowl vent lines are perfect, no leaks or kinks?
The diaphragms in the carbs are in perfect shape?
Did you try running 100LL and taking a look at the color of the spark
plugs?
You are running the proper heat range spark plugs?
Back to timing, are the proper plug wires are attached to the proper
plugs?
Is it a air leak somewhere like a O ring not installed or ripped carb
boot, disconnected hose causing a air leak?
If all checks out OK, is it possible that someone switched your new
cylinders for junk somewhere/somehow along the line?
Let us know what you find.
Ron P.
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