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Thread: Atc 200x blowing gray/black smoke?

  1. #1
    Join Date
    Mar 2020
    Location
    Georgia
    --
    88

    Atc 200x blowing gray/black smoke?

    I’m stumped here. I have an 85 200x with Mikey's upgraded 30mm carb, but the stock exhaust. He said it was fine to run the stock exhaust on it. I plan on buying a new pipe later, but my question here today is. Why Is it running so rich? I guess it's running rich. Usually, black smoke means rich, blue means oil, and white means coolant, but that's literally impossible since there isn't coolant, lol. It fouls plugs, but every three-wheeler I've owned does it. When I got the carb about six Months ago, it had a 110 main. It ran rich, which is odd considering the carb's throat is bigger, but now it bogs if I slam the thing to full throttle. I've taken the main down to a 100, and it's still doing it. Do I need to go lower? Do I need to drop my pilot jet size? Am I missing something here? The only other things done to the engine are a 12-1 wiseco piston and the carb. Another thing I notice while idling is that it seems like there is condensation building in the exhaust??? You can visibly see water droplets at the end of the exhaust.

  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,757
    Wiseco pistons are known to smoke , their 200x piston rings suck IMO especially when you ask them to seal a 12-1 compression piston .

    Their are obvious differences in the smoke , easiest way to tell is if it smells like burning oil it’s rings and if it burns your eyes terribly and smells like excessive fuel it’s a carburetor / fuel issue .
    78 atc 90/180cc Dickson Full Suspension
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    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

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  3. #3
    Join Date
    Mar 2020
    Location
    Georgia
    --
    88
    Gotcha. It doesn’t smell like burning oil, but I could be wrong, and it could be burning it much worse than I assumed. I’ll try that eye test; if that fails, what rings should I get?

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