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Mend MTD 287707 Lawn Mower Carburetor Engine

Engine speeds up and slows down?

I have a MTD Yard Machine model:287707 Type:1224E1 Code:09941220. The motor cranks fine and runs but it speeds up and slows down constantly (bested described as loping?). I have notice a arm on top of the carb that is attached to a spring and this is waht is moving back and forth. What causes this and how can I fix this issue? Any help will be greatly appreciated!!

TSR3901
April 2009
MTDMTD 287707Garden Tools, Lawn MowersLawn Mower Carburetor Engine
This is a symptom of a lean mixture - which in turn could be due to stale fuel. Use fresh fuel, and if you still have a problem (and you have checked for leaks as suggested), back out the main jet 1/4 turn at a time to see if that improves things.

phil_saunders(a)bigfoot.com

Phil Saunders
April 2009
Check for air leaks at the inlet manifold, also make sure crank case breathers are clear, and air filter. This is only general advice though sorry. hope it helps.

stu
April 2009

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