Thread: What causes low rpm hesitation?

Tweet

The metering rods are hooked to a piston that raises them out of the jets upon acceleration. If they are in any kind of a bind you would run lean until they pop out of the jets. I've also seen the rubber on the accelerator pump roll up a bit to where you don't get a full shot. There is also a tapered check valve in the primary discharge circuit that could be sticking.

Check and see if the accel pump is giving a healthy shot of fuel with the engine turned off and your head over the carb with the filter off, if its a weak shot.. try putting in a new accel pump. Could also be your mixture is off? Just a couple thoughts since I've experienced the hesitation blues for about 3-4 months until i figured it out.