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Andrew, sorry to labor on the fuel pump, but I'm thinking the fuel pump is leaking internally. Kind of like a heart murmur where the diaphram has a small hole and as it pumps gas it is also squirting gas into the crankcase via the plunger. You wouldn't see this from the outside. Fuel pump would have to be pulled and examined. This may be the source of gasoline in your oil. How strong is the gasoline smell in the oil? The breather hose that goes to the air filter housing lets out a small amount of oil vapor, and the gasoline in the carbs go down to the intake manifold, it should not go backwards and into that breather hose. If your engine is a stock setup I can't think of another gasoline source to your oil in the crank case.
Jones
69-912
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