Black smoke on decelleration

Discussion in 'Touring Models' started by Kenr427, Jul 5, 2008.

  1. Kenr427

    Kenr427 Account Removed

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    I have an 02 FLHTCI with 22000 miles. I get black smoke when I rev it up and let off the gas...I'm not talking about overly revving the engine, I mean around 3000 rpms or so. I always thought that black smoke means its running rich...it is a stock bike. Also used about 2 1/2 qts of oil on a 2000 mile trip. I also notice that my oil seems to get real dirty after about 500 miles...I bought it with 16000 miles on it, and have changed the oil every 3000 miles or sooner because I was trying to clean out the crank if it was that dirty. I ready to burn the thing up!
     
  2. glider

    glider Veteran Member

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    2 1/2 qts of oil on a 2000 mile trip is a lot of oil. I would do a compression test and a leak down test to see what kind of shape the cylinders and rings are in.
     
  3. Bud White

    Bud White Well-Known Member Retired Moderators

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    For sure a leak down test an compression test are the ends of the pipes/mufflers oily like its burning it

    Oil burns blue raw fuel is black but if its overly rich and it could be burning both as fuel loads up in the crankcase

    How does it run in general ?
     
  4. Kenr427

    Kenr427 Account Removed

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    bike runs fine, compression test showed 130 at each cylinder, black sooty deposits at the pipes, not oily
     
  5. Bud White

    Bud White Well-Known Member Retired Moderators

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    black sooty is rich then if its real heavy ... leaking oil somewhere? if its burning it ..it should show on the pipes
     
  6. Kenr427

    Kenr427 Account Removed

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    I'm wondering if it may be the valve seals because it only smokes when I let off the gas
     
  7. Doc 1

    Doc 1 Member

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    Your compression is down quite a bit....it should be 150 or better in both cylinders.
    Your injectors could be dirty and leaking giving you the over rich condition
     
  8. cansel kansu

    cansel kansu Member

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    isnt 13 or 15 bar too high for the compression test? is the compression ratio 15:1 on these engines?
     
  9. glider

    glider Veteran Member

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    CR more like 9 to 1
     
  10. Sharky1948

    Sharky1948 Junior Member

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    Alternative solution: Don't ever decelerate! (Sorry, couldn't resist the slow ball over the middle setup for that one!)