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Carb trouble

Discussion in 'Motorcycle Tech Talk' started by PHIL1951, May 5, 2011.

  1. PHIL1951

    PHIL1951 New Member

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    I'm new to your sight and looking for some help! I have a 96 dyna, stock except someone beat the baffles out of the pipes before I bought it All of a sudden It decided to to start spitting and sputtering off idel. I have taken the carb apart, cleaned the jets, put new intake kit on it, but the the problem still continues. It will run fine with the choke pulled atleast half way out. :witsend: ANYBODY have any suggestion? Thanks
    PHIL1951, May 5, 2011
    #1
  3. Lucifer

    Lucifer Well-Known Member

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    Re: Carb trouble ?

    Check to see if you get a squirt of gas from the accelerator pump nozzle when you blip the throttle....if nothing or very little prolly the acc pump diaphragm ...does it idle OK??
    Lucifer, May 5, 2011
    #2
  4. PHIL1951

    PHIL1951 New Member

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    Re: Carb trouble ?

    I replaced the diaphragm when I had the carb off. This problem started over nite, it wasn't something that came on over time. Would a faulty enrichner cause the problem? It's just to nice here in Daytona Beach to not have my bike running. Thank you for your reply, if you can think of anything else please let me know. Phil
    PHIL1951, May 5, 2011
    #3
  5. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Re: Carb trouble ?

    Does this bike have the vacuum operated fuel valve? I had sold my original gas tank to a buddy and he gave me his gravity fed petcock and mine had the vacuum fuel valve and he had problems. He couldn't run either unless the chock was out a little ways. Just a thought.
    JohnnyBiker, May 5, 2011
    #4
  6. kenfuzed

    kenfuzed Administrator Staff Member

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    Re: Carb trouble ?

    Double check the rubber manifold boot. If it cracked or the carb is not seating you will have an intake leak requiring the extra enrichment.

    Another possibility is debris or crud could have been pulled into a passage. With compressed air try blowing out the 2 air jet passages visible at the front of the carb's intake. I would also remove the mixture screw, clean, and reinstall. Just be careful not to lose the spring/washer/o-ring above the mixture screw. Also count the number of turns on the screw (screw inward and count) so you can return that to it's original position.

    As a side note I'm moving this message thread over to the Motorcycle Tech Talk forum since this forum category (CV Performance) is for tech support of CVP products.
    kenfuzed, May 5, 2011
    #5
  7. bguillory66

    bguillory66 Active Member

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    Sounds like the problem I had with my 96 FXDL, it was a leaking intake manifold, can check it by spraying some carb cleaner or a cleaner way using a unlit propane torch around the manifold while bike is running, if engine speeds up or down manifold is leaking. Good luck:D
    bguillory66, May 5, 2011
    #6
  8. PHIL1951

    PHIL1951 New Member

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    Ok, here we are still working on the carb. We had alot of good input, thank you but nothing is working. We had a sugestion from our neighbor to check the vacum operated electric switch. Anybody know anything about that, or how to eliminate it (by pass it)? Thank you, Phil
    PHIL1951, May 7, 2011
    #7
  9. chucktx

    chucktx Moderator Staff Member

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    check the sensor on the intake manifold. had a bike with a vacuum leak this week. chased it all over. the sensor on the manifold was at fault.
    chucktx, May 7, 2011
    #8
  10. PHIL1951

    PHIL1951 New Member

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    ok new issue, got a new jet from a 42 to to a 45. starts good, don't even have to use the choke. Now out of 3rd gear it's acting like it's starving for fuel. wtf....It starts right up, idles great. Now what should I do, should I drop it back down to a 42?
    PHIL1951, May 7, 2011
    #9
  11. chucktx

    chucktx Moderator Staff Member

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    before ya start jumping around to other problems, did ya get the first one taken care of???
    chucktx, May 7, 2011
    #10
  12. cowboy

    cowboy Moderator Staff Member

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    Ya fix one befroe you make another , or you'll open a can of worms :banghead:
    cowboy, May 7, 2011
    #11
  13. JohnnyBiker

    JohnnyBiker Well-Known Member

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    V=vacuum
    O=operated
    E=Electrical
    S=Switch

    The V.O.S.E. sends a signal from the carb to your timing unit. It will advance your timing under load.
    JohnnyBiker, May 7, 2011
    #12
  14. Lucifer

    Lucifer Well-Known Member

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    Nope....45 pilot is the right jet for a BT.....check for intake leaks if none check the float height...eliminate one possibility at a time....
    Lucifer, May 8, 2011
    #13
  15. JohnnyBiker

    JohnnyBiker Well-Known Member

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    Wouldn't jacking his main jet up help if he finds no leaks? In Theory?
    JohnnyBiker, May 8, 2011
    #14
  16. Lucifer

    Lucifer Well-Known Member

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    If he was running at WOT in 3rd...I'm kinda thinking restricted fuel flow is the problem if there are no air leaks...float too low or partially plugged fuel line or petcock...should be able to run pretty much stock jetting with only punched mufflers for mods...
    Lucifer, May 8, 2011
    #15
  17. berzerker

    berzerker New Member

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    Hi I am new to this sight and have a similar problem with my 04 883 XL, The bike runs great on the road but when I stop it spits and sputters terribly off idle while blippin the throttle. Ive taken the carb apart and cleaned it, Ive checked for vacum leaks I replaced the accelerator diaphram but nothing seems to work. I jetted the carb changed the aircleaner and the mufflers long ago. the problem just started this spring. any ideas?
    Last edited: May 8, 2011
    berzerker, May 8, 2011
    #16

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