15 horse Briggs eating spark plugs?

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Thread: 15 horse Briggs eating spark plugs?

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  1. #1
    Join Date
    Jul 2021
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    Knee Vah Duh
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    15 horse Briggs eating spark plugs?

    I am pretty green with ohv engines so I thought it would best I asked you folks your opinion. My engine keeps killing spark plugs. They are not carbon fouled or oil fouled as far as I can see. They just stop working. I am at a loss as to why it?s happening. If I pull the plug wire and wedge it 1/8 inch off the top of the plug, it starts up and runs fine. If I connect it to the plug then it won?t run.

    It has:

    New plugs
    New coil
    New ignition
    New carburetor
    Fresh gas
    Charged batter

    Has anyone ever experienced this? What could it be???

  2. #2
    Join Date
    Dec 2018
    Location
    Muskoka, Ontario
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    95
    I would check the high tension wires for continuity/bad connections/messed up heads where they connect to the spark plugs themselves. Sounds like when you wedge them around you force them to make a connection but when they are resting where they should be the connection is lost

  3. #3
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    I picked up 2 new spark plugs. Napa had NGK?s so I bought them. I figured that maybe the Chinese plugs will play right with the Chinese electronic ignition lol.

  4. #4
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    Thank you, I will check that.
    It was doing it before I converted it over to electronic ignition. And seems like it?s still the same problem but I swapped the coil and plug at the same time so I can?t confirm that the original plug had gone bad. I think already threw it away so I can?t put it back in. When it stops running and I replace the spark plug, it starts and runs like it should.

  5. #5
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    May 2009
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    NJ 08533
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    What engine model do you have?


    My new beer holder spilled some on the trails - in it's hair and down it's throat.
    Joe Camel never does that.

    Advice is free, it's the application that costs.

  6. #6
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    While I let this turd idle for a couple hours yesterday, I wasted time working on the tire guides. I got half of the guides for one track modified. After I finish those, I?m gonna build a guide to attach to an angle grinder so I can cut the knobs off the inside of the tracks. I bought one of those chainsaw murder wheels from Harbor Freight to use for that. The rubber knobs stand about 3/4? tall, are about 1? by 1? at the base and they?re every roughly every 2?. Removing them will maximize the retention ability of the tire guides. I need to build a guide that won?t let the murder wheel cut too deep into the track, so won?t it ruin it. I?ll post what I come up with. I?m thinking something similar to the guide on a skill saw.

  7. #7
    Join Date
    Feb 2013
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    shenendoah valley,va.
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    sounds good ...maybe the carb out of adjustment is definately affecting the plugs . looking forward to seeing your tracks . keep at it , jboy va.

  8. #8
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    Well it seems to be running fine with the new plug. I let it idle for several hours today and it didn?t die. The carb is definitely out of adjustment. It revs very sluggish and blew a cloud of black smoke lol.

  9. #9
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    Jim:
    It?s a single cylinder 15 or 16 horse Briggs. It?s the old style with an up draft carburetor. Other than that, I?m not sure of a model number. It was painted before I got it.

  10. #10
    Join Date
    Feb 2016
    Location
    Mississippi
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    1,108
    So what is the time interval between fails? Does it run only a few minutes before failure or days? Hypothetically if your engine mounts were bad and torque is causing your engine to move around a bit, is there anything the plug can come into contact with and perhaps break the insulation?

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