I'm seeking some advice. I have a Honda BF45A 1994 and I recently had the carbs rebuilt. I've changed the oil several times and it seems like there's gas in the oil. It smells like gas anyway. The oil turns bad immediately. I trolled maybe for 3-4 hours and it comes out black and smells like gas. I noticed some foam (kind of yellowish) under the oil fill cap. The engine is running great though. Any suggestios?