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Cv tuning question AGAIN...

Discussion in 'Motorcycle Tech Talk' started by Derek02deuce, Jun 10, 2010.

  1. Derek02deuce

    Derek02deuce New Member

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    ok guys, i need some help once again. so i turn to you all with the knowledge. i swapped the 48 slow jet back in tonite. 195 main is still in. now this is where im lost and at wits end... when i turn the idle mixture screw in to lightly seated, the motor should start to run rough as the mixture is being leaned out at this point correct??? i did just that and there was no change in engine speed. i backed it out 2 1/2 turns. hell i even took it out for a ride and seemed to run smoothly :cussing:. can somebody or some of you please help me. im not sure where to go from hereagain
    Derek02deuce, Jun 10, 2010
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  3. Derek02deuce

    Derek02deuce New Member

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    oh yeah i forgot to mention that the bike is still hard to start back up once its warm
    Derek02deuce, Jun 10, 2010
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  4. chucktx

    chucktx Moderator Staff Member

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    are you increasing the idle speed when adjusting???? it needs to be around 1200 or so and it needs to be at operating temp......about 10 miles of riding.....
    chucktx, Jun 11, 2010
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  5. cowboy

    cowboy Moderator Staff Member

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    i would start the idel at about 1000 these TC seem to like that , then go higher if need be
    cowboy, Jun 11, 2010
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  6. hotroadking

    hotroadking Super Moderator Staff Member

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    Idle should be 1000
    but when you tune
    get it warm then open throttle to 1200 to 1500, lock with throttle stop screw

    Then adjust.

    if you are turning the screw in (leaner) and it doesn't change
    the pilot jet may be too large.
    hotroadking, Jun 11, 2010
    #5
  7. Derek02deuce

    Derek02deuce New Member

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    yea with the bike warmed up and idling at 1000, i can turn the mixture screw to lean it out and it does nothing to the engine. im going to try a 46 slow jet tonite and go from there
    Derek02deuce, Jun 11, 2010
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  8. chucktx

    chucktx Moderator Staff Member

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    let us know!!!!
    chucktx, Jun 11, 2010
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  9. Derek02deuce

    Derek02deuce New Member

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    well the carb now has a 46 jet in now. throttle response seems to be a smidge better. had it at normal operating temp. idling at 1500.still no change when turning the idle mixture screw. set it at 2 turns out and set idle back to 1000. going to ride it like this to i get some more ideas. thanks guys for all the help
    Derek02deuce, Jun 12, 2010
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  10. cowboy

    cowboy Moderator Staff Member

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    sound's like your real close to where it need to be :D
    cowboy, Jun 12, 2010
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  11. fxdxriderleo

    fxdxriderleo Active Member

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    In the instruction from the CV kit, you warm the engine, set idle speed to 900-950 rpm. Turn mix screw in till it stumbles. Then back out till it runs smooth then + 1/8 turn. Maintain the idle speed as you adjust the mix screw.
    Now blip the throttle, If the engine revs with no carb backfires your good, if it back fires, back the mix screw out another 1/8 turn.
    As you test ride watch for backfires or sluggish responce at idle and off idle. If backfire to lean,back off mix screw. If sluggish, to rich, turn in the mix screw.
    If you can't get it with the screw between 2-3 turns you need a different slow jet. Less than 2 turns is to big a jet try one size smaller, if more than three, jet is to small, go up one.
    the main jet is a whole nother thing.
    fxdxriderleo, Jun 13, 2010
    #10

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