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Thread: High speed puff of smoke from exhaust

  1. #1
    Senior Member jannaruto's Avatar
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    High speed puff of smoke from exhaust

    Hey guys,

    I was yesterday going around with some of my TW friends
    Basically all the TWs when max throttle at high speed they produce a lil bit of clear smoke, a very small small small puff, I guess is kinda normal
    But one of the bikes produced a grey puff of smoke, sometime even one after another, like 2-3 puffs of smoke in 4-5 seconds
    The smoke puff is kinda "big" like the size of a tire diameter, greysh coloured, and only when you use throttle a lot or when at high speed you open it completely

    What can cause this?
    Maybe idle mix screw?
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  2. #2
    Super Moderator Purple's Avatar
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    Did he wash the bike recently ?
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  3. #3
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Purple View Post
    Did he wash the bike recently ?
    Not that I know, but let's say he did? But as said I am quite sure last time he washed was like 1 month ago or more
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  5. #4
    Ken
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    Senior Member Ken's Avatar
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    The rings may be starting to get a bit worn. Black smoke is usually the carb misadjusted. I usually will just keep a good eye on the oil level and (if it's not real cold) add Lucas heavy duty oil stabilizer or use 20/50 weight on the next oil change. The Lucas may tighten clutches up which can adjust out. If you ride cold freezing weather I wouldn't do anything other than watch that oil level.
    littletommy likes this.

  6. #5
    Senior Member scotti158's Avatar
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    I think the TW was sending some smoke signals saying "HELP ME".
    Ken, grewen, ejfranz and 2 others like this.
    2013 Yamaha TW200

    1996 Yamaha TW200

    1995 Kawasaki KLR650

    2002 Yamaha RoadStar 1600 with sidecar

  7. #6
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Ken View Post
    The rings may be starting to get a bit worn. Black smoke is usually the carb misadjusted. I usually will just keep a good eye on the oil level and (if it's not real cold) add Lucas heavy duty oil stabilizer or use 20/50 weight on the next oil change. The Lucas may tighten clutches up which can adjust out. If you ride cold freezing weather I wouldn't do anything other than watch that oil level.
    So I should make the mix a bit leaner maybe? Like 1/4 or 2/4 of a turn in?
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  8. #7
    Super Moderator Purple's Avatar
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    Likely over-filled with oil - but you may want to check his air filter first, in case it's got either wet, or excess oil / fuel in there

    Always look for the simplest fix first ......
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  9. #8
    Senior Member jannaruto's Avatar
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    Quote Originally Posted by Purple View Post
    Likely over-filled with oil - but you may want to check his air filter first, in case it's got either wet, or excess oil / fuel in there

    Always look for the simplest fix first ......
    What do you mean with overfilled with oil? Like instead of putting 1 liter he put 1,2 liters?
    Air filter is clean
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  10. #9
    Super Moderator Purple's Avatar
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    Pretty much, yeah - easy to do if both wheels are not level

    On the air filter, take a look at the tube underneath the air filter box - if there's anything in that tube, that may be the problem
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  11. #10
    Senior Member elime's Avatar
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    Sounds like oil smoke, maybe rings, maybe valve stem seals, maybe both. If it only happens after extended high speed / wide open throttle runs I wouldn't worry about it. When / if it reaches a point where it is smoking all the time, or nearly all the time then fix it.

    You can play with the carburetor if you want to but I really doubt it will make a difference. If the bike is running well I would leave the carburetor alone as chances are it will run worse after "adjusting the carb." and it will still smoke.
    grewen, Ken, littletommy and 1 others like this.
    Long live the internal combustion engine!

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