I noticed one oil pump where the lever was not fully returning, due to some hangup in the internal gearing. I have a new cable on the sled. I have concluded however, that the cause of the excessive oil that does not want to burn off, is that I stored the sled with the carburetors still plugged into the rubber boots, so that the oil that leaks through the oil pump whether the engine is running or not, slowly ran into the engine and accumulated in the bottom of the crankcase. Then upon restart, it burns excessive amounts of oil for at least 1/2 hour before starting to clear up. If I stopped the engine before all the excessive oil was burned out of the engine crankcase, and let it sit overnight, then the plugs were fowled on the next attempt to restart the engine. In conclusion, the engines should be stored for periods of more than 2 weeks, with the air box removed and the carburetor pulled out of the rubber boots enough so that oil that is gravity fed into the carburetors, does no drip into the rubber boots.