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Kohler engine

Discussion in 'General Chit-Chat' started by Bill Blue, Nov 21, 2019.

  1. Bill Blue

    Bill Blue Diamond Level Sponsor

    Trying to start a 14hp single cylinder Kohler. Been setting about ten years. It will not run. Seems to have good compression. It either 1) fire into the exhaust, or 2) kicks back against the starter. I feel this is eminently unfair. It should do one or the other, not both.

    Any ideas why this is happening?

  2. puff4

    puff4 Gold Level Sponsor

    Magneto ignition?
  3. Bill Blue

    Bill Blue Diamond Level Sponsor

    Yes. It fires, but has yet to have a power stroke.
  4. MikeH

    MikeH Platinum Level Sponsor

    Carb float valve issue. Dumping raw fuel into the intake? I’ve had flooding issue with my JD X300 mower. In fact I was mowing once and it flooded out and stalled. Fuel in. cylinder could cause the kick back. Fuel in the muffler cause the flame after it attempts to fire.
  5. Bill Blue

    Bill Blue Diamond Level Sponsor

    The plug is not wet. First attempt to start was with choke on, throttle wide open. It cranked for sometime before anything happened. I think it was a few kickbacks, then fire into exhaust. That scenario has been repeated several times. Take it off choke, after a couple of misfires, it spins with no further fuel ignition. Remove plug, it is dry. I have squirted fuel (fresh) into the cylinder. Afterfires and kickbacks. Not one solid hit. Ever.

    I wonder, it has been stored in a shed. Am I experiencing rodent damage to the ignition system?

  6. puff4

    puff4 Gold Level Sponsor

    Perhaps. Is the flywheel tight on the crankshaft? If it’s magneto driven then the spark timing comes from the flywheel position relative to the crank. If the woodruff key has been damaged (like when a mower hits a rock) then the flywheel can move relative to the crank and the timing will be all over the place.
  7. sunalp

    sunalp Platinum Level Sponsor

    Mike H hit it on the head. If it's been sitting for 10 years more than likely the carb is all gummed up
    and the needle and seat are probably stuck. Especially since you're not getting the proper fuel flow.
    Just drop the fuel bowl off the bottom of the carb and clean everything.

    Hope that helps.
  8. Barry

    Barry Platinum Level Sponsor

    Assuming that you have flushed / replaced the old gas and the carb is not gummed up, it sounds like the ignition timing is either 1) late or 2) early (or maybe some of both). A good look at the points and condenser seems appropriate.
  9. husky drvr

    husky drvr Gold Level Sponsor

    Sticking or burned exhaust valve??

    Good luck.
  10. Bill Blue

    Bill Blue Diamond Level Sponsor

    Fixed it!
    Long story. The engine is really 15 hp mounted on a pressure washer and has a recoil starter! About ten years ago, I decided to install a starter. Bought a used starter and flywheel on Ebay and installed them. Then, things get a little foggy. I thought I used it a time or two before putting it away. But evidently not. The parts were for a 16 hp engine, not a 15. The difference is in the ignition timing. The 16 uses electronic spark control and advanced static timing. My engine had the "dumb" ignition, which gives too much spark advance at low speed, hence the kickback.

    The solution was to remove the starter ring gear from the 16 hp flywheel and install it on the 15 hp flywheel, it came from the factory ready to accept the gear. Sounds simple was was a ton of work, mostly due to the sheared Woodruff key jamming the flywheel in place. Once all the cursing was done and out of the way, it fired up about the second time over.
  11. puff4

    puff4 Gold Level Sponsor

    Ha! Well, I was at least on the right path. :)

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