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Push mower blows gas out muffler - Craftsman Garden

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Your needle valve under the float jet in the carb is stuck.
You need to pull the carb apart and clean the needle valve under the float.
With it in the stuck open position, your gas will flow to the carb air intake and flow out onto the deck of the mower.

Posted on Sep 25, 2009

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Posted on Jan 02, 2017

  • 59 Answers

SOURCE: My grandson was mowing with the 22 inch push mower

first, be sure someone has not over filled the oil. if thats ok, sounds like the piston rings are shot.

Posted on Sep 23, 2010

cq92
  • 184 Answers

SOURCE: push mower won't start. Oil coming out of muffler

Your motor is pooched. Oil is not supposed to come out the exhaust. It indicates a worn out motor or something broken inside like a piston or compression rings. Or possibly someone has put half a gallon of oil in it instead of half a quart and it's well overfilled?

Posted on Aug 31, 2009

vincob
  • 718 Answers

SOURCE: my lawn boy 6.5hp mower isblowing fuel out of the muffler

Maybe it's a stuck float valve or a bad float. Had a similar problem on a TORO rider but that turned out to have a pin hole in the brass float, it filled up with gas and let just about the hole tank through the muffler. I changed the brass float and still running to this day! Note: your float may not be brass if it is a newer machine it will be plastic.

Posted on Oct 01, 2009

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Turned mower on its side and changed the blade and now the pull rope is very hard to pull..its almost like the motor is locked up..I checked the shut off linkage cable,removed the spark plug, removed the...


Your piston cylinder is partially full of oil and/or gas. Take the spark plug out and pull the rope four or five times to blow everything out of the cylinder. If it's still hard to pull over with the plug out check the oil level in the crank case to see if it filled with gas while the mower was on its side. Make sure the plug is dry and clean and reinstall it. When it starts it's going to smoke a lot until it cleans out the cylinder.

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