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18 HP Briggs and Stratton OHV Model 31M777 runs rough

Single cylinder - ran good set a week started up runs rough won't come up to high speed. Does not die but sounds like it is running in slow motion. I changed fuel filter- air filters- spark plug ( old one looked almost fouled out. No change

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  • panilling9
    panilling9 May 11, 2010

    check carb. to be sure it is not loose

    and be sure the choke is not partially closed due to a loose cable at the choke cable or throttle control cable

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Have you checked the choke? Sounds like it might be stuck closed or partly closed.

Posted on Jun 22, 2009

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A more likely cause is a clogged jet in the carb.

Remove disassemble and clean Carb, the High speed idle jet is clogged.

If you had a fuel pump problem it would not run even in the Choke mode.

This tends to happen when an engine sets for long periods of time with out a fuel inhibitor id is even more likely to happen if you use fuel with ethanol.

Hope this tip helps.

r/David

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