Compression Problem?

Discussion in 'Lawn Mowing' started by MWHC, Aug 25, 2000.

  1. MWHC

    MWHC LawnSite Member
    from Wyoming
    Messages: 243

    I have a Toro Proline 5.5 engine that is giving me some problems. Sometimes when I go to pull start it, I about turn the mower over physically. It feels like the compression is way high(Really hard to pull). If I pull slowly through this rough part, I can start it. I have adjusted the valves and that didn't seem to help. Any suggestions?
  2. mowerconsultant

    mowerconsultant LawnSite Fanatic
    Male, from Syracuse, NY
    Messages: 9,772

    it is possible you have a partialy sheared flywheel key.

    stretches those couple of fingers real good though...
    just a thought, i would look at the flywheel key...
  3. SMB

    SMB LawnSite Senior Member
    Messages: 322

  4. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,262

    I had a Kawasaki 5hp 21" mower that did the same thing. The dealer told me that the problem was unburned gas was in the cylinder. I can't remember how it was fixed(sorry). I don't have that mower any more.

    BUSHMASTER LawnSite Senior Member
    Messages: 519

    My buddy brought his toro over to me one afternoon with the same problem pull the plug pour out the gas ..drop the carb
    bowl. take out the needle. squirt some carb cleaner in to the seat and blow out the trash ,clean the bowl ,reinstall and
    start cutting again hope this does it. easy fix.and change the fuel filter if yo dont have one on it put one on it.

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