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Mountfield rotary 4 stroke grass cutter motor 'hunting' continuously.

Machine still cuts grass, but is difficult to start. Engine 'hunts' all the time.

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  • Norman Price Apr 22, 2014

    Thanks for previous answers, but they do not fully address my problem.

  • Norman Price Apr 22, 2014

    Add a CommentI have to prime the engine up to 20 pushes on the primer button, and when it does start the engine is continuously speeding up and slowing down again. I've called thos 'hunting', but there may be a more technical term for it. I've checked the line from the petrol tank to the carb. and it is ok

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Norman PRICE THE WORD HUNTINDG IS TRUE THE MOTOR IS LOOKING FOR FUEL ON SOME MOTORS YOU ADJUST THE MIX ON THE CARB CHECK THE AIR FILTER TO SEE IF PLUGED ON A FOAM FILTER YOU CAN CLEAN ON A PAPER YOU WILL NEED TO REPLACE. ANOTHER THING IS HOW OLD IS THE GAS . TODAY THE GAS IS ONLY GOOD FOR A MONTH,

Posted on Apr 26, 2014

  • Norman Price Apr 26, 2014

    Dennys2360. Many thanks for your answer. The air filter is foam and clean, but must admit the gas is about a year old. I didn't know that gas today degenerates so quickly..

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SOURCE: Kia ora, i have a

Engines need 4 things: Spark, compression, fuel, exhaust

1) Does spark plug have spark?
Take out plug, put plug wire back on plug, hold plug threads against metal part of engine, pull cord, do you see spark between plug and engine?

2) While spark plug is out, put finger over hole and pull cord. Do you feel suction that shows compression?

3) What about the exhaust port? Is the screen blocked with carbon deposits and dirt? Soak it in WD-40.

4) Do you have 2-cycle oil in gasoline? Do you have fresh gas? Did you leave gasoline in tank for several months? Is the carburetor clogged with gum?

5) What about the air filter? Does it fire up without air filter? Will it fire if you spray WD-40 into carburetor? Can you keep it going while spraying WD-40 into carburetor?
If it fires with WD-40 but won't keep going on it's own, then the gas is not getting to carburetor or carburetor is clogged with gum.

Posted on Oct 08, 2010

SOURCE: May 4, 2011 I purchased

I have the same model purchased last spring from Home Depot. I finally learned to prime it 6 times instead of 3 like it says on the mower. After pushing the primer 6 times mine starts fine. It usually requires priming even when the engine is warm to get it to re-start unlike any mower I have had in the past.

Posted on Sep 17, 2011

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