Question about Briggs & Stratton Briggs Stratton Intek V - Twin Vertical Ohv Engine with Electric Start 22 Hp, 1" X 3 5/32" Shaft, ModelNo. 44K777 - 0027 - E1

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B&S engine backfires, runs better with choke 1/2 out under load??

22 hp intek b&s Changed fuel filter, spark plugs(gapped at .040 per owners manual), air filter, etc. Back fires through muffler, at all speeds. Engage blades, same thing. Pull choke 1/2 out, and it runs a lot better, with little to no backfiring. Will not run better with choke out when they are disengaged, only when engine is "loaded" Checked fuel filter and noticed it was empty. Presumed I had a faulty fuel pump. "Borrowed" fuel pump from co-worker. Same results. Fuel filter fills up when sitting and mower off. Start mower, and it runs well for 10-15 seconds, then filter get sucked empty and backfiring starts. Is there a screen/filter in tank that is dirty??? Have been told everything from blown head gasket to bad/misadjusted valves to carb plugged. Still doesn't explain the empty fuel filter which I feel is the main problem. I have changed fuel filters since this started with no help. Have never noticed fuel filter to be empty before, always approx 2/3 to 3/4 full when running, but cannot be sure because I've never really paid that much attention when it ran good. Any help would be appreciated.

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  • Anonymous May 23, 2009

    I had the nearlly the same problem. come to find out it had a bent push rod that had fallen off. I put a new one on and it runs fair. Just seems to be a junk motor

  • aps95z28 Jun 01, 2009

    Ok, mowed 2 weeks ago, and problem somehow disappeared. Mower ran great, started mowing with the choke 1/2 out like I explained above, and hoped off to move kids toy about 20 minutes into yard and noticed no backfiring at low rpm with blades off. Opened the throttle up, ran great. Stayed this way the rest of the day. Got on this last Saturday, expecting the same thing. Nope, started backfiring about 15 minutes into mowing. Only thing I did this week was put new gas in (premium because I was told that 87 octane makes them run like ****, been using it for about a year) and topped off the oil because it was just a tad bit low. I'm pulling my hair out now. Guess its off to the shop with it.




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Check your rockers inside valve covers. They some time work loose. If they are loose the push rod will fall off rocker and cause the problem.

Posted on May 31, 2009


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