Home Forums 2-Cycle Racing smoking Yamaha

This topic contains 4 replies, has 4 voices, and was last updated by  John Wehrheim 6 years ago.

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  • #9398

    Colin
    Participant

    Hey guys. I recently fired up my freshly rebuilt Yamaha for the first time. Lots of smoke coming out and wet black oil dripping from exhaust. Any ideas? Did I mix too much oil? 8 ounces in one gallon. Thanks! Colin

  • #9399

    Colin
    Participant

    <div class=”d4p-bbp-quote-title”>Colin wrote:</div>Hey guys. I recently fired up my freshly rebuilt Yamaha for the first time. Lots of smoke coming out and wet black oil dripping from exhaust. Any ideas? Did I mix too much oil? 8 ounces in one gallon. Thanks! Colin

    Also I had the needles set at 2 1/4 and 3/4

  • #9421

    Jim White
    Participant

    If this was just warming up on the stand 2 1/2 on the low is way too much and is probably the problem. On the track under load that settings fine. To just run it on the stand with no load it’s just way rich. I usually warm mine up on the stand at 1 to 1/12 on the low.

  • #9555

    Doug Huggler
    Participant

    the cc fluid may have been dumped into the bottom-end after the rebuild
    this will cause lots of smoke and oil out the pipe.
    2 1/8 and 1/4 should be good for ontrack break-in

    Doug Huggler
    253-219-1011

  • #9560

    John Wehrheim
    Participant

    It will smoke and drip oil until everything is well sealed and you did have the high needle rich if you ask me.

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