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When the mower is started it runs very smoothly. The blow by from engine comes through the valve on side through floor of Carburator housing fouling air cleaner. when air cleaner off oil is sprayed on engine from bow by opening.

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Posted on Sep 29, 2009

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Interesting as smooth idle and sputter are contra-indications.
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There is a blow by tube from the crankcase that goes in just before the carb. If you have too much oil, at high speed the crankcase pressure will blow the excess oil right into the air filter. Same thing with bad rings or valve guides. The pressure blowing by the rings at high speed is over pressurizing the crankcase and causing the oil to blow into the air filter. You need to do a cylinder pressure check. Putting the piston at top dead center, and charging the piston head with air. The flywheel can not be allowed to move or it may move the piston or open one of the valves. If the pressure drops, then you will need a ring job. Squirt some oil into the piston, and re pressurize, if the pressure drops again, chances are you will need new valve guides. The oil squirted into the piston chamber will seal the rings, causing the pressure drop through the guides.
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Hello there,when i starts z car in z morning,blue smoke comes out.Is that normal please.And z car miss fires if i accelerate suddenly.I have changed z distributor,spark plugs n wires.Z car is of carburator...

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Think oil ran in carb

Try to always tilt a mower with the front of a horizontally mounted engine up in the air (head with spark plug end). This will keep the oil from going places it doesn't need to into the carb/air filter area and along the valves into the cylinder head and combustion chamber (unless you get lucky and the piston is running the compression or power stroke with valves closed). You probably loaded the crankcase breather with oil which in turn loaded the carb with oil when you started running it as it vents over via a metal tube an inlet in the air filter housing.
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