Bike won't start without throttle then runs really rough/no power

Discussion in 'Engine, Fuel and Exhaust' started by AdamControl, Jul 17, 2013.

  1. AdamControl

    AdamControl New Member

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    Hey guys! Just got a quick question and I searched and haven't found anything similar to my problem so I'm turning to you guys.

    Not all that versed in Harleys but I got a rat bike I put together. It has a stiock 99 Sportster 1200 Evo. CV carb. Bike ran perfectly for a few years since I put it in the bike and regular maintenance done.
    No, however, it won't start without giving it throttle otherwise it floods really fast. When it starts it runs and rides really rough with no power and again, cuts out when I let go of the throttle. I did disasseble the carb and dunk it in cleaner (first time doing it and was kinda expecting to mess it up) but the problem is still exactly the same. Plugs look good also. Any ideas?

    Thanks in advance
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Welcome to The Forum. Have you put any NEW parts in the carb after cleaning it?
     
  3. AdamControl

    AdamControl New Member

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    Thank you. No, just a new fuel inlet.

    I did notice some oxidization on the accelerator pump diaphragm.....maybe I should get a rebuild kit and try again you think?
     
    Last edited by a moderator: Jul 23, 2013
  4. HDDon

    HDDon Experienced Member Contributor Retired Moderators

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    Sounds like you need to get a rebuild kit for the carb. The E10 gas eats the rubber parts up.
     
  5. 01 rk

    01 rk Active Member

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    Have you done a compression test?
     
  6. Jack Klarich

    Jack Klarich Expert Member

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    Harley Davidson Forums Here is a break down of your carb, I would for sure go thru it with new parts
     
  7. AdamControl

    AdamControl New Member

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    I have not done a compression test. Not sure how.

    Sorry, just saw that break down, thanks for that! I will look through it......just ordered a rebuild kit.
     
    Last edited by a moderator: Jul 23, 2013
  8. 01 rk

    01 rk Active Member

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    Do you have a compression tester?
    Remove both plugs, throttle wide open, crank it over 3-4 times each cylinder.
    Reading should be similar in each cylinder.
    Hope this helps.
     
  9. Slo-Ryd

    Slo-Ryd Junior Member Contributor

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    And always put the plugs back on the ends of the wires and ground them to avoid damaging the coil and/or ignition.
    [​IMG]
     
  10. 01 rk

    01 rk Active Member

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    Thanks BigAl66 for catching that, I forgot it in one of my senior moments.