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Mountfield petrol mower HP470 problem with starting -I've checked plug and petrol both ok. It has a Briggs and Stratton engine. Ideas please. Thank you. '

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Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming the carburetor a few times or spraying starting fluid into the carburetor, 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/weedeater 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, You will first seat the jet screws and 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 do not forget to rate me,
Thanks
Good Luck,
I hope this helped

Posted on Aug 11, 2010

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Posted on Jan 02, 2017

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