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Yardman intek 12A-979L401 runs with white smoke and stops, the ohv valve cover is full of a oil and gass mixture, the oil fill has the smell of gas in it

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The carburetor has probably malfunctioned and the needle valve is staying open. It is responsible for most of your problems. Oil will HAVE to be changed, Don't run it till fixed. Pull carb, disassemble and clean noting condition of internal parts. Install rebuild kit if possible. The white smoke is a result of either water in the gas or gas in the oil....or a combination of both.

Posted on Jun 13, 2010

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Posted on Jan 02, 2017

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Cranks but sputters, blows grayish/white smoke, and I do smell gas in the oil. What could cause this?the blades it cuts off.


do not run or try until you change the oil . sometimes the float sticks in the carb and fills the crankcase with gas . I like to add an inline shutoff valve .

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Sounds like a bad head gasket. Check your oil after car sat all night. See if there is white , or any signs of water in your oil. Smell dipstick at the same time to see if there is the smell of gas in the oil. While car is cold check the coolant for traces of oil in the cooling system. , or the smell of gas present. When the head gasket goes,it no longer separates the different ports for oil, coolant, and gas mixtures. What happens is that coolant gets into your engine cylinders where gas, oil, and air mix, and ignite. This causes steam to come out of the tail pipe. If you are going to change it yourself, keep me informed and I can walk you through it. What size motor is in the car?

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check the oil see if it smells like gas if so the carb is not sealing over filling and draining into the oil a new carb can go bad or ts gas from the bad old one

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1 Answer

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smell the oil and see if it smells like gas the needle valves don't seat and gas overflows into the crankcase if so change the needle and seat and change the oil run it without a load and the change the oil a second time

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Check your oil.

If it is overfilled, milky, or smells like gas. Your going to need to change that ASAP. It sounds like the float has stuck in the past or is still sticking, and it has flooded the crankcase with gas, which has mixed with the oil. And because it is overfilled it comes through the breather hose into the carb. This also explains the smoke most probably because the oil is spewing in the carb through the breather and being burned.

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When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.

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White smoke in a small engine is oil. Oil in the cylinder will create too much pressure for the engine to achieve compression. Make sure the engine is not getting fuel into the oil and thinning the mixture (literally smell the oil... gasoline and oil smell nothing alike, if it smells like gas, it is). If this is the case, the carb is leaking fuel into the engine, thinning the oil and causing the oil to leak past the rings into the cylinder head, through the valves and, from there, into the exhaust to burn off. Black smoke indicates a direct fuel issue in a small engine, white is oil based.

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