Is this normal

Discussion in '2-Stroke Engines' started by seth martin, Mar 10, 2008.

  1. seth martin

    seth martin Member

    i have a 33cc two stroke and i havve noticed what looks to be oil comming out near the exhaust is this normal? and if so how come its just oil when i mix it with the gas?

  2. gone_fishin

    gone_fishin Guest

    more detail please, in the title and the post. remember you're a co-author of this repair manual...some other new guy may need to find this someday.

    that's not a personal dig, it's merely a lesson in forum-usage :)
  3. mickey

    mickey Guest

    Some oil remains unburnt in a 2 stroke and condenses in the exhaust. Is there a lot of oil in the muffler? Isn't your bike brand new? Are you running an oil rich break-in mix? What does the spark plug look like? Oily?
  4. seth martin

    seth martin Member

    its 25:1 it was in the manual to break in and run it on 25:1....its not a whole lot but enough that i notice and yes its new but i ride it alot...the oil i put in is blue and when it comes out its grey/ guessin this is the carbon?...the spark plug has a small amount of brown residue on it kinda on the threads...i just need to know cuz i have 2 more weeks onm the warranty and dont know if i shpuld send bacjk....
  5. loquin

    loquin Active Member

    as mickey indicates depending on the engine make, between 5% and 30% of the fuel goes straight through a 2-stroke engine without being burnt.

    Some of the oil will condense in the muffler, as it cools down.

    Oil molecules are larger and heavier than gasoline molecules, and so, they will condense at higher temps, and will not easily evaporate, as the gasoline will. (This difference in condensation temperatures is how the oil companies separate crude oil into it's components in a distillation tower at the refinery.) In your case, the oil condenses out in the muffler, while the gasoline goes on through.

    A small amount of oil is normal.

    The reason that it is black is because of the carbon. The dye, which caused it to be blue, was probably burnt & broken into carbon also.
  6. seth martin

    seth martin Member

    ok i thought it was normal weedeaters and such are always oily so i figured this should be to would cuttin it down to like 4 ounces a gal help instead of 5 or should i stick to what it says
  7. kerf

    kerf Guest

    Stick to the manual.
  8. seth martin

    seth martin Member

    ok will do i put some stong work shop rags folded them up and put uner the rack and the motor where the oil seems to go to absorb it the rags touch nothing hot or moving
  9. One of my HT engines will drip from the exhaust and one doesn't....I asked Duane at Dax what might be the cause and he suggested that my float may be hanging up and letting a minute amount of fuel through the engine when it is off....I disassembled the carb to make sure the float moves no more problems!....(when it was a problem I used to put a tin can under the exhaust to catch the drips....not a lot granted but enough to make a little mess over time....If your carb doesn't have a sticky float I would guess the above posts would likely be the answer to your problems.
  10. loquin

    loquin Active Member

    I would guess that it would depend somewhat on driving habits, too. If you take the bike on a lot of short trips, the exhaust may rarely get hot enough for long enough to burn out all the residual oil.
  11. seth martin

    seth martin Member

    i tend to go on alot of short trips but usually allow warm up for a min or 2