I had a similar issue with the engine running rough between 2500 and 3500.
After researching on the web I found someone with the same problem.
What he found was there are 3 ports that are drilled in each carb and the
outside plugged with steel balls and the epoxy applied over them to seal any
leaks. With time the epoxy cracks allowing air to leak in. I resealed on both
carbs and the roughness went away.
Bill
N51EU
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