1956 Evinrude 3hp, oil mix ?

Discussion in 'Bubba's Outboards' started by kyron4, May 17, 2009.

  1. kyron4

    kyron4 New Member

    Messages:
    185
    State:
    Indiana
    I have a 1956 3hp Evinrude Lightwin . The motor says to use 1/2 pint SAE 30 oil to one gallon of gasoline, which is 16:1 . Evinrude told me as a general rule, useing modern 2-cycle oil, use a 20:1 mix in 1958 or older motors. So considering modern 2-cycle marine oil what mix ratio would be need to run and proteced the motor properly ? My friend who got it running for me used a 50:1 and it ran well on the test trip (one full tank), but is this to "thin" a mix to protect the motor ? -Thanks
     
  2. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    yes 50:1 is way to thin for that engine. It has bronze bushing for bearings instead of needle bearings. They started using needle bearings in the lat year of 1958 but just on the bigger h/p engines. The needle bearings didn't come into use on the smaller h/p until late 63. I would mix my fuel for that engine at 24 to one that will give you the right expansion on the oil in the bronze bushing.