[tony zambos]

brian,
for my enlightenment, what kind of carb is this and what kind of motor is it. Most 2-cycle kart engines won’t idle. And if you set the carb to idle, more than likely you’re running too rich to run on the track. Way back, I did use a piece of a match book cover under the butterfly stop to keep the plate partially open and the engine idling. On the first blip of the throttle, the match book cover was gone.

[brian heaton]

My bad… I’m running a cr125, with a Keihin PWM. I believe my kart mechanic, set it up to run rich so I can run the top end longer between rebuilds.  I don’t plan to race any time soon,  so getting it to idle would be a great help.

 

[Noah Stark]

What pilot and needle are you using? If you set the PWM to idle, you can easily cure the issues you are describing with minor changes.

Idle is around 20-24 clicks out, pilot 55-58, CCJ, CGJ, CGK needle P4 or P5.

[Author]

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