spitting and jerking

Discussion in 'Engine, Fuel and Exhaust' started by slowboy, Nov 25, 2011.

  1. slowboy

    slowboy Member

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    My '95 Badboy has gotten to where when I'm cruising at 45mph in 5th gear, it wants to jerk and pop [seems popping through tail pipes]. I can pull choke out about a third of the way, and bike runs better, except when I come to a stop, then it is idling too high. Both plugs have been fouling, but mostly rear cylinder plug. It is not gas or oil fouled. It is a dry black sooty foul with no smell [gas or oil]. A while back, a mechanic adjusted [I think, the needle...he said it had a clip on it and he raised clip up a notch...]. It seems to me that the bike is starving for gas, and possibly needs this clip put back to where it was, at least.
    Am I thinking right here, or is there something else I should check for. All help and info is greatly appreciated ! !
     
  2. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    Sounds like an intake leak. Check the rubber sleve that connects the carb to the intake manifold.
     
  3. Redfish-Joe

    Redfish-Joe Senior Member

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    +1 on what Don said.
     
  4. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    Depends on how the needle was adjusted if the needle was raised it would make the mixture a wee bit richer and if it was dropped it would make the mixture a wee bit leaner
    pulling the choke out will also make the mixture richer as it adds fuel and that could be the cause of the dry soot on the plugs
    as has already been stated check for an intake leak that would tend to make the mixture weak

    Brian
     
  5. glider

    glider Veteran Member

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  6. johnflorida

    johnflorida Member

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    45 is a little slow for 5th gear. Maybe you're just lugging the motor
     
  7. glider

    glider Veteran Member

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