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  1. #1

    Black from exhaust?

    I took my 2001 Yamaha XLT 1200 out for a quick spin yesterday and after I got it home, I noticed a lot of black on the hull around the pump. It was all coming from the exhaust. Im running premix and the time before this run I had idled around for about 15-20 minutes on a no wake pond. Do you think this black could have just been build up from extended idling and not clearing it out or did I likely just blow something?


  2. #2
    MSX 150 guy lives on Mr. GP1800's Avatar
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    It’s a 2 stroke. It’s going to have dirty exhaust

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    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by Pullen724 View Post
    I took my 2001 Yamaha XLT 1200 out for a quick spin yesterday and after I got it home, I noticed a lot of black on the hull around the pump. It was all coming from the exhaust.

    I’m running premix and the time before this run I had idled around for about 15-20 minutes on a no wake pond.

    Do you think this black could have just been build up from extended idling and not clearing it out ...
    Is this watercraft new to you?

    Pre-mixed fuel tends to produce more exhaust soot, especially at low engine speeds.

    Some 2-stroke oils burn with less soot than others. None produce zero soot, especially when running slowly.

  4. #4
    Ok. Thanks. It is relatively new to me - just first time I noticed it.

  5. #5
    WaterDR's Avatar
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    Probably normal. 2 strokes are nasty and dirty especially with pre-mix.

    A few other thoughts....does the machine also have an oil injector and is their oil in the tank?

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