Gas and Oil Ratio Question and Disscussion

Discussion in 'Motorized Bicycle General Discussion' started by Solmangrundy, Apr 17, 2014.

  1. Solmangrundy

    Solmangrundy New Member

    Joined:
    Apr 15, 2014
    Messages:
    21
    Likes Received:
    0
    Just woundering if it makes a diffrence going from 16:1 to 20:1 and so on. Is there any benifit/gain or is the only purpose is to produce less smoke?
     
  2. 2door

    2door Moderator
    Staff Member

    Joined:
    Sep 15, 2008
    Messages:
    16,304
    Likes Received:
    29
    There is a lot of information available here about 2 cycle oil mix. You're going to get a lot of discussion regarding what is right and what is wrong.

    It has been determined by many experienced builders that the kit recommendation of 16:1 is too much oil. We recommend starting at about 24:1 and moving down to 32:1 after a couple of gallons burned. This is a good, safe, ball park figure and you won't go wrong following it.

    Try using the search feature and type in 'Oil Ratio" and you'll have an evening worth of reading to do on the subject.

    Tom
     
  3. Nashville Kat

    Nashville Kat Active Member

    Joined:
    Apr 20, 2009
    Messages:
    1,433
    Likes Received:
    1
    I put a dollop in the 2 liter tank when I put in gas- usually adding from about 1/4 full up to about 3/4 or slightly more gas in the tank- never fill it quite all the way- and have never really ran it out.

    so I guess I'm actually putting about a liter in the tank most of the time-
    about $.60 to $.85 worth if I'm at the pump-

    a dollop is usually a couple of seconds from the oil bottle. If it seems like there's too much oil smell or coming out the exhaust, I do a little less then.

    I'm very scientific!
     
    #3 Nashville Kat, Apr 18, 2014
    Last edited: Apr 18, 2014
  4. Solmangrundy

    Solmangrundy New Member

    Joined:
    Apr 15, 2014
    Messages:
    21
    Likes Received:
    0
    im pretty much trying to get at, at what point does adding more/less oil help like are you getting more combustion out of a lean oil mix instead of going on the rich side.
     
  5. Nashville Kat

    Nashville Kat Active Member

    Joined:
    Apr 20, 2009
    Messages:
    1,433
    Likes Received:
    1
    I've personally found the china girl only runs sour when the mix is too lean-

    it's just messy and smelly and drips oil from the exhaust if it's too oily,

    but too lean and it really doesn't seem to build up a steady fire somehow.

    But I'm not that high performance oriented-
    just the straight NT Speed card with a straight billet intake and standard kit exhaust-

    the performance is pretty much the same most of the time then
     
    #6 Nashville Kat, Apr 18, 2014
    Last edited: Apr 18, 2014
  6. Theon

    Theon New Member

    Joined:
    Jan 20, 2014
    Messages:
    1,440
    Likes Received:
    0
    Less oil means more fuel which means engine runs rich.
    Engine should be tuned to a certain oil mix.
    I just swapped my Softail from 25 to 1 to 40 to 1 and now it 4 strokes and needs a re tune.
     
  7. 2door

    2door Moderator
    Staff Member

    Joined:
    Sep 15, 2008
    Messages:
    16,304
    Likes Received:
    29
    Ditto and is one reason guys, like me, who run our mix @ 100:1 need to go small on our main jets. Less oil to gasoline and you'll have to go leaner on the fuel to air mix.
    It's a juggling act but it can be done with some experimentation.

    As for lubrication, sufficient or lack of, you'll need to follow the recommendation of the oil manufacturer. There is no benefit to using more oil than they say to use. In other words if the oil maker says 32:1, then adding more oil is not really going to help. It might even cause problems like fouled spark plugs or clogged exhaust systems plus the mess associated with an oil rich mixture.

    Tom
     

Share This Page