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Briggs and stratton Low engine Power

I have a Snapper 21" mower powered with an 875 series Briggs easy start engine, the past week the power level / range has dropped off by about 30-40%,

Does anyone know what may have caused this and what can Be done about it? Otherwise the mower is a good machine, however at 4 years I dont want to be singing servicing costs into it if its a big deal, I would ratehr put the money towards new Kit.

Am I right in assuming this would be a Govenor issue? Im thinking not carb As the running of the engine is very smooth otherwise and even, no hunting or struggling.

If so, can anyone point me in the direction to tune up the revs?

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  • PRO
    Hi David have you done the usual things such as check the plug, fuel lines and fuel tank are clean clear?
    Has the mower been bashed by accident or something blocking throttle travel?
    Anothe thing is the air intake clear as that would reduce power?
  • Plugs been swapped over, fuel lines and carb have an inline filter which I swaped too so should be, Will double check and clear them out with air tomorrow.

    Im assuming its been beated up in the van to be fair....

    Didnt think air intake (Its too obvious isnt it!) - I've got a spare filter so will swap over.
    Cant find the manual or a guide to adjusting the goveneor which my gut screams will be something to do wiht it.
    That said itl be something even more obvious now, such as no fuel or wheels.

  • PRO

    I think that's an Intek engine ? May be worth a compression test to see if any bypass on the piston or more likely valves ? We had similar on a Hayter 53 with a 675 B&S. Turned out to be a burnt valve, leaking compression.

  • Thanks Gary - Didnt think of that one either, I've just replaced the gov springs and air filter now and no improvement, so Its looking like this could be the route cause.

    In which case, poor thing is a spare machine now. :( Alas it was a cracking mulcher and had good speed.,



    Gary RK said:

    I think that's an Intek engine ? May be worth a compression test to see if any bypass on the piston or more likely valves ? We had similar on a Hayter 53 with a 675 B&S. Turned out to be a burnt valve, leaking compression.

  • PRO

    Does it rev out to 3000-3250 rpm without hesitation with no load applied (check via digi tacho) ? Might help identify if running gear (belts/gearbox) are sapping power.?

    If an engine issue, expect to pay £260-£325 for dropped shipped, new "plug in" replacement engine. For our 675 it was ~£260.

    If you have major engine issues, by the time you buy spares, mess around/pay labour etc it works out quite cost neutral and you get a new lease of life :-)

  • Had the piston out this even - hairline cracks and the rings were totally gone....... Also heavily worn bearings everywhere - Compression was obviously the issue.

    Not bad for a mahcine that does 50% of all my grass cutting, and 100% of it in 2010/11. Rough guess is over 2500 hours of use........ Mulchin mostly too so it was always at full whack and under stress.

    I will look at spares / new engine, but to be fair Its had its day, the deck its dinted underside and The drivetrain is badly worn in places, wheel bareings worn etc....

    sadly not a cheap fix - If it was less than £100 Id fix it but It looks like time to thing hard on that toro Turfmaster!

  • PRO

    Well at least you now know. It may be uneconomical then to refurb etc.

    If you decide on a new engine, I'll can ping the details across otherwise...where's that Toro brochure ?

    The you need to do some of that 'man maths' stuff ...:-)

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