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Carb rejetted and now hesitation!

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  • Carb rejetted and now hesitation!

    Hello guys. I recently had the shop install Cobra Longs and rejet the carb with genuine Mikuni jets from jetsrus. They installed the 167.5 main and the 37.5 pilot jet. The bike runs super and sounds great. However today while riding the bike hesitates under heavy loads ONLY in 4th and 5th gear. Hard acceleration in 1,2,3 are fine. When in the upper gears it almost seems to be lugging and when I crack the throttle it almost stalls for a few seconds then gains acceleration. What in the world could it be? It's the first time I have really tried the bike out since getting it back from the shop a few weeks ago. The Cobra longs also have the baffles in place. I did not have them removed. Any thoughts and advice would be greatly appreciated.

  • #2
    Is the engine bogging down or the clutch slipping?
    With enough beer you can do anything...D.Pate

    Comment


    • kevin_Pianoman
      kevin_Pianoman commented
      Editing a comment
      I just installed the barnett clutch conversion about 400 miles ago. It was not doing this until the carb was rejetted.

  • #3
    I would check the PMS screw. Tighten it all the way (gently) and then back it out 2.5 turns.

    Comment


    • kevin_Pianoman
      kevin_Pianoman commented
      Editing a comment
      I will see if I can get to it.

  • #4
    I wonder if the shop adjusted the accelerator pump duration screw? The pump should squirt fuel out of the brass tube in the mouth of the carb thru to about 3/4 of the throttle travel. (or just under 3/4)

    Comment


    • Bikerron
      Bikerron commented
      Editing a comment
      Pull the air filter and give the throttle a twist. Doesn’t need to be running. You should see a squirt from the spray bar immediately.

    • davej
      davej commented
      Editing a comment
      maybe even the needle clip in the wrong groove. setting to low and not letting enough fuel pass at higher speeds.

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