Off throttle backfire

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by 5 speed, Oct 26, 2012.

  1. Aussijussi

    Aussijussi Long timer

    Joined:
    Oct 29, 2009
    Oddometer:
    1,152
    Location:
    Finland-Australia
    +1 I probably fall into 'the worry wart' category too, i think it's mainly due to the avalanche of information the net brings with it. After reading dozens of different enquirys about water pump, clutch slave, fuel pump, clatter at starting the bike, fuel mapping, etc etc.... One starts to imagine all sort's of sounds, coming from the engine. As you said, just ride the frigging thing!
    Although i can't, due to snow:cry
    #21
  2. fastdirt505

    fastdirt505 Adventurer

    Joined:
    Sep 4, 2012
    Oddometer:
    70
    Location:
    Suwanee, GA
    Mine definitely backfires under 5k rpm with the throttle closed. I have my spark arrestors out of the FMF pipes which makes it worse. I have to decide if I want heads to turn when downshifting to a stop or not. If I don't want the attention I just pull in the clutch or you can give the throttle just a slight turn to silence the pops. The bike runs great but backfires.
    #22
  3. Groundhog

    Groundhog Been here awhile

    Joined:
    Nov 7, 2005
    Oddometer:
    188
    Location:
    Kansas Flatlands
    Just an idea. I had a lot of popping and backfiring on deceleration on my '07.

    Then I (just) repacked my FMFs and almost all of it went away! Imagine that! I had about 12,000 miles on the original packing.
    #23
  4. Zuber

    Zuber Zoob

    Joined:
    Sep 28, 2004
    Oddometer:
    2,606
    Location:
    Main Street, Shedd, Oregon
    I haven't read if the SAS is still on this bike. That thing injects air into the exhaust and makes it backfire, just like an exhaust leak.
    #24
  5. K2m

    K2m ....58....

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    Feb 27, 2005
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    2,238
    Location:
    Sydney Australia
    You better come back home digga There's a beer in the fridge :freaky
    #25
  6. K2m

    K2m ....58....

    Joined:
    Feb 27, 2005
    Oddometer:
    2,238
    Location:
    Sydney Australia
    Exactly what I do at 2 in the morning.

    I luv it as it swears at the world. Reminds me of racing car cams, feels like them to as you open it up and it springs into life......... Best part of riding this bike in traffic........ Why would you want it to feel/sound like a 1975 Honda CB250..... :puke1 :lol3
    #26
  7. fastdirt505

    fastdirt505 Adventurer

    Joined:
    Sep 4, 2012
    Oddometer:
    70
    Location:
    Suwanee, GA

    I just recently installed the CPR intake and CJ Designs jetting and all the backfiring went away. I am still running the FMF pipes without the inserts. I guess my bike wasn't jetted correctly coming from Florida to Georgia, although it ran fine it backfired. Now the backfiring is gone.
    #27