How to tell if mixed gas was not used...

Discussion in 'Lawn Mowing' started by Likestomow, Aug 30, 2005.

  1. Likestomow

    Likestomow LawnSite Senior Member
    Messages: 997

    I want to buy a used 21" Lawn Boy that isn't running but I'm afraid it might be shot due to running straight gas. Will I be able to tell by the way the engine turns over? Would a compression test prove it?
  2. Metro Lawn

    Metro Lawn LawnSite Silver Member
    Messages: 2,116

    The oil in the gas is used for lubrication. Most times if a machine is run with straight gas it will lock up and you won't be able to turn it over.
  3. Brianslawn

    Brianslawn LawnSite Silver Member
    Messages: 2,002

    ditto. compression will help also maybe leak down test. make sure rings arent worn or something cracked. might just be bad carb.
  4. mowingmachine

    mowingmachine LawnSite Senior Member
    Messages: 253

    If it ran for any length of time without oil it shouldn't even run. If it didn't seize up from lack of lubrication then it will most likely show signs of a severe loss of compression. I have seen 2 stoke snowmobile engines get trashed from lack of lubrication. It's not pretty.


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