When you step on the gas and get a stumble or hesitation it's typically caused from a lean fuel condition

MOST LIKELY CAUSES:

• accelerator pump plunger is adjusted wrong or needs to be replaced
• throttle cable is out of adjustment (we do not have any adjustment info for the throttle cable)

OTHER POSSIBILITIES:

• pump jet clogged

• high-speed valve improperly adjusted

  

• discharge check valves (weights) out-of-round or seat worn

• accelerator pump linkage defective or worn

• power piston sticking or worn

• power valve not seating properly, spring worn, or power jet clogged

• reloader out of adjustment

• float level too low

  

• throttle valve misadjusted

  • With primary throttle valve fully open, secondary throttle valve should also be fully open. If necessary, adjust valve openings by bending throttle shaft link. Secondary throttle valve should begin to open when primary throttle valve it 60 degrees open.