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Hot!Misfiring Briggs and Stratton 5.5hp rototiller

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smallmechanic
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2019/04/29 22:59:10 (permalink)
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Misfiring Briggs and Stratton 5.5hp rototiller

Hi all,
New here.
I gave a rototiller that is misfiring.
I have checked the timing, got new spark plug and gapped it, also gapped magneto. I gave a new magneto arriving tomorrow. If it is not that what other thing could it be? Suggestions? Thanks.
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    Roy
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/04/30 00:45:07 (permalink)
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    Welcome aboard. Try an inline spark tester, it will show an ignition misfire and is a lot cheaper thaan a new magneto. Also check valve clearances.
    Quote  #2
    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/04/30 09:12:01 (permalink)
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    Ok will get a spark tester and YouTube the valve clearance.
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/05/04 22:53:42 (permalink)
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    Put new spark plug(ngk) and magneto. It has a really good blue spark.
    Same thing. It also has fumes of unburned fuel coming out of the exhaust.
    I a mb wondering it's running rich. How do I tell if it is and how can I adjust the carb? I'll try tomorrow taking of the air filter and seeing if it runs better to diagnose if it's running rich.
    I have not checked valves yet.
     
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/05/04 22:54:42 (permalink)
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    Please help 36 people have looked but only one reply.
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/27 08:30:38 (permalink)
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    I gapped the valves. New carb, really good spark. ANY other ideas?
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/27 08:30:47 (permalink)
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    thanks!
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    Roy
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/27 12:55:25 (permalink)
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    Can you post the numbers off the engine? I wonder if the valves are not seating, maybe the guides are worn. Is the new carb OEM or aftermarket?
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/27 19:59:16 (permalink)
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    The carb is aftermarket. Would that make it not work very well?
    The model is: 126302
    I have the stuff to lap the valves. Should I do it?? 
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    Roy
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/27 22:49:27 (permalink)
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    If you want to go to that much work you could pull the head and check the valves and guides for wear. A leakdown test would be quicker if you have access to the tool and an air compressor. Is it just an annoying miss or is performance suffering?
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    smallmechanic
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    Re: Misfiring Briggs and Stratton 5.5hp rototiller 2019/10/28 08:11:00 (permalink)
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    I have an air compressor. What tool do I need?
     
    Performance is suffering real bad. IT has no power. 
    Quote  #11
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