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If the engine on your snowblower starts to smoke, here is what to do.
If blue smoke is coming out of your engine exhaust, it usually means that oil has leaked into the combustion chamber. Maybe you had tipped your snow blower on its side and spilled oil on the engine? Or it could be that the operator incorrectly used a 2-stroke engine fuel mixture in a 4-stroke engine? In a 2-stroke engine, a small amount of blue smoke is normal. A lot of blue smoke usually means that the oil to fuel mixture ratio is incorrect, that there is too much oil.
If black smoke is coming out of your snowblower engine exhaust, the air-fuel mixture is probably too rich and there is too much fuel in the engine. Check the choke to be certain that it is fully open. If the choke is open but the black smoke is still spewing, you may have a carburetor problem.