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Tecumseh that dies off

Discussion in 'Mechanic and Repair' started by jdmekus, Oct 6, 2009.

  1. jdmekus

    jdmekus LawnSite Member
    Posts: 2

    I have a 5.0 tecumseh OHV that is very hard to get started and after it does start it will run good for about 5 min. then lose all power. Anyone have any helpfull tips for me to check to get this thing running the way its suppose to. Thanks for any info.
  2. topsites

    topsites LawnSite Fanatic
    Posts: 21,653

    It might be the coil gone bad, they start to act up as the engine warms.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Most likely low compression/worn valve guides.....
  4. jdmekus

    jdmekus LawnSite Member
    Posts: 2

    Forgot to mention that it blows smoke out of the vent on the valve cover. And the compression was 40 on 1st pull, 45 on2nd pull, and 50 on 3rd and held for 5 min. Also the spark looks good with engine cold, why would it mess up warm.
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    50 isn't enough for easy starts or proper running and if it didn't hold 50 there'd be a problem with your compression tester.

    Pull the head and you will most likely find the exhaust valve guide worn badly, It's pretty common on these engines.....

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