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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-12-2012, 08:28 PM   #1 (permalink)
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White smoke after throttle blip

Hi all,

After a short ride today on my 08 Scrambler, and while waiting at a stop light, I noticed a small puff of white smoke after 'blipping' the throttle. Nothing while warming it up before with the choke on or off and no smoke while giving it gas, only after giving a little blip.

Bike seems to be running just fine - strong and consistent.

Weather was clear and in the 70's (typical SoCal fall weather).

Help?
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Old 11-13-2012, 02:21 AM   #2 (permalink)
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Puff of white smoke? Maybe there's a new Pope!
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Old 11-13-2012, 05:01 AM   #3 (permalink)
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Indians ?
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Old 11-13-2012, 07:30 AM   #4 (permalink)
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Blue smoke indicates oil is being burned. Black means an excessively rich mixture that produces sooty deposits after part-burning.

White smoke could just be either water vapour in certain atmospheric conditions or unburned, raw fuel being expelled. If you can place your hand on the end of the exhaust and catch some of it you can feel and smell if it's water or fuel.
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Old 11-13-2012, 09:24 AM   #5 (permalink)
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Quote:
Originally Posted by Forchetto View Post
Blue smoke indicates oil is being burned. Black means an excessively rich mixture that produces sooty deposits after part-burning.

White smoke could just be either water vapour in certain atmospheric conditions or unburned, raw fuel being expelled. If you can place your hand on the end of the exhaust and catch some of it you can feel and smell if it's water or fuel.
This...
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Old 11-13-2012, 10:33 AM   #6 (permalink)
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Thanks for the replies,

It's definitely not moisture - there is a very strong 'exhaust' smell. I'm still a newbie and can't tell if it's excess fuel but the smoke is most certainly white.
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AI removed and NARK'd -145/40 2.25 turns
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Old 11-13-2012, 10:56 AM   #7 (permalink)
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If it's white smoke it's steam. Water condenses in the exhaust system, mixes with burned fuel vapour and exits as smelly white smoke. Nothing to worry about.
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Old 11-13-2012, 12:04 PM   #8 (permalink)
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Well that's reassuring. Should I expect the smoke to go away once the bike has been sufficiently warmed or will it persist?
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Old 11-13-2012, 12:27 PM   #9 (permalink)
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Yes, it will go away when the water's boiled off from inside the exhaust. The colder and damper the air the more condensation there will be.
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Old 11-14-2012, 01:20 PM   #10 (permalink)
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Ethanol fuel blends or condensation can leave collections of water in the low parts of your fuel system. An occasional stabilizer treatment (I use Seafoam or Techron injector cleaner) will re-suspend the H2O in your fuel and prevent the recurrence of pooling.
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