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Mountfield sp470 petrol mower

Hello
the problem with the mower is that when you prime and start it runs for 3 or 4 seconds then cuts out. If you keep priming the mower is continues to run. Is this problem common and easy to fix?

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 37 Answers

SOURCE: mountfield sp470

Hi, first you'll have to change the air filter and the spark plug. now, go buy some hi octane gas. drain the old gas and put the fresh gas in. if this don't solve your problem please write again.

Posted on Nov 23, 2008

  • 198 Answers

SOURCE: my lawn mower starts easily, then shuts down. each

disassemble the carb and make sure the float valve is not sticking

Posted on May 10, 2010

hunter19_46m
  • 7482 Answers

SOURCE: I can crank my murray gas lawn mower 6.5 quantum

Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

Posted on May 15, 2010

  • 2926 Answers

SOURCE: My lawn mower starts, runs for about 5 seconds and

The engine is starving for fuel, that is why it will keep running while you force the fuel to the engine with the primer button. At this point, the carb will have to be removed,disassembled and cleaned. I'm sure you will find blockage and dirt in the carb and also in the small orifices for air and fuel flow.

Posted on May 31, 2010

SOURCE: lawn mower will start when primed but will only run for few secon

It starts because of excess fuel from priming. It usually then gets it fuel from main jet in carb.

You need to find the main jet and run a fine piece of sturdy wire through it. That will restore fuel flow so your mower can continue running after the priming fuel is gone.

This is a good thing to learn. Main jets tend to clog a lot on mowers these days.

Posted on Jul 06, 2010

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Mountfield sp470


Hi, first you'll have to change the air filter and the spark plug. now, go buy some hi octane gas. drain the old gas and put the fresh gas in. if this don't solve your problem please write again.

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