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Help White Smoke from tail pipe on 1964 yamaha yds3

Discussion in 'Yamaha 250cc 2 Strokes' started by tschaeff, Sep 28, 2016.

  1. tschaeff

    tschaeff Member

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    I have a '64 yds3, I replaced all of the seals last year and finally got the bike all back together. I took it out for a little test riding and it was fine but then all of a sudden it fouled the left cylinder. I got it home but now it is blowing white smoke and spitting oil out of the tail pipe. Is it my crankcase seal? Are there seals that I missed when I replaced them last year? I did not split the cases last year. Did I miss something.
     
    tschaeff, Sep 28, 2016
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  2. gregt

    gregt Well-Known Member Premium Member

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    White smoke says oil...Left hand plug fouling says outer left hand crank seal leaking gearbox oil into the crank chambers.

    Just how many seals did you replace anyway without splitting the cases ?
     
    gregt, Sep 29, 2016
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  3. pkay

    pkay Junk Accumulator

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    I think you will have missed the inner seals and are getting transmission/gearbox oil inducted into the combustion chamber with the fuel mixture charge. The seals that close up your transfer system are inside the crankcase.
    But before you worry about that can I confirm that the YDS runs an autolube pump. If yes check that setting and functioning first and make sure it is adjusted correctly just to ensure it's not the problem. Have a sniff of the oil from the exhaust or what's on the pluig to see if it's oil from the gearbox or the engine.
     
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    pkay, Oct 5, 2016
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