Need help with Briggs & Stratton Intek 17HP motor

Discussion in 'The Garage' started by SoilSampleDave, Apr 7, 2011.

  1. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

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    Ah, where to start. I have a Snapper rear engine mower (you know, like the one your grandfather stood up on its end to sharpen the blade) , with the above mentioned B&S Intek engine. About 2 weeks ago, after about 20 minutes of mowing, it just quit. No blubbering, just quit like you pulled the plug wire off. Hit the starter and it fired right back up. For 20 seconds, then it died again. Started again, died again, pushed it in the garage. Decided it must have been a fluke and started mowing again a couple of days ago. Ran 20 minutes, died like first time. Restart, die. Push in garage. Tried googling some answers; most pointed to the fuel pump, but in the Snapper application, gravity is your fuel pump. I also saw mention of the fuel shut off solenoid at the base of the float bowl, so just in case, I removed it and took off the brass "hat" that closes off the fuel supply and re-installed. Start, run briefly, die. Then read that my valves may have tightened up, although, again my spider sense is telling me this electrical. OMG is my exhaust valve tight. I adjust it and it is way harder to pull over using the pull cord just to see how hard it was. Hit the starter and it sprung to life with a much healthier rumble, more like when it was new. Very happy for a minute, then it died again. Now I am thinking it is the coil, which is actually the magneto and coil all in one I guess. I notice that the outer edge of the flywheel has moderate coating of rust on it, as does the business end of the magneto that is excited by the flywheel. I hit both with a light sanding and then wipe down with CRC 5-56. One thing I cannot find online is what the gap should be between the magneto and the flywheel, so I push it to almost touching. Turn the key, it pops once, but won't start. I then put a new spark plug in, won't start. Should I just buy a new magneto ($40 - $50)at this point? What should the gap be between the mag and the flywheel? Any help would be greatly appreciated.:cry
    #1
  2. aussie_king_mick

    aussie_king_mick Been here awhile

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    #2
  3. aussie_king_mick

    aussie_king_mick Been here awhile

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    #3
  4. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

    Joined:
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    Oddometer:
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    I don't know how I missed that website, but it is a wealth of information:clap

    Thanks AKM :freaky
    #4
  5. aussie_king_mick

    aussie_king_mick Been here awhile

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    yeah, it's good eh dave...i used to be a motor mechanic (now management) and I find that website excellent...glad to help mate:D
    #5
  6. larryboy

    larryboy Chopper Rider

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    Use a dollar bill to set the gap between the mag and flywheel.
    #6
  7. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

    Joined:
    Jan 21, 2005
    Oddometer:
    3,109
    Location:
    The Delta Ghetto, GA (aka PTC)
    Holy cow. That brought back memories. I can remember my uncle doing that! Anyway, it is at 0.012" now and I have mega spark. I also have good compression, so tomorrow the gas tank gets dumped and the carb gets cleaned. And that should do it.
    #7
  8. baloneyskin daddy

    baloneyskin daddy bikaholic

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    A lot of these engines have low oil sensors that go bad and shut the ign. down to save the eng. Disable the sensor and try it, just be sure to check the oil level.
    #8
  9. motoxer667

    motoxer667 Been here awhile

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    Lebanon, Ohio
    How long will it run if you let it sit? I had a fuel pump go on my mower (not a Briggs) and it would run for a short time then stall repeatedly.
    #9
  10. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

    Joined:
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    She runs! I took the carb off and gave it a good soak in in the new ADVrider favorite, Pine Sol, cleaned it, and put it back on. Dumped the old gas in the tank in my company car :evil and filled her up with fresh gas. Just finished mowing for 30 minutes. :clap
    #10
  11. larryboy

    larryboy Chopper Rider

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    Mow, Forrest, mow. :lol3

    Good job!! :thumb
    #11
  12. NateLePain

    NateLePain Long timer

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    The whole carb or just pieces? How long did you let it soak?

    Thx
    nlp
    #12
  13. SoilSampleDave

    SoilSampleDave Dr. Zaius was right!

    Joined:
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    Oddometer:
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    Location:
    The Delta Ghetto, GA (aka PTC)
    Only about 6 hours. It really didn't seem all that dirty. I took the float bowl off and removed the float and needle before soaking the entire carb. I did remove the sideways mounted jet that sort of meters the fuel coming into the float bowl, but I could not get the main jet out. After rinsing off the pine sol, I hit all the passages hard with compressed air and then followed up with carb cleaner.
    #13
  14. StandupWI

    StandupWI Adventurer

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    Oddometer:
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    For future reference its 0.010"
    #14