The Prairie 650 runs fine but seems to pop alot at idle. No backfiring just popping and stuttering. At speed it is fine. I always need to choke it to start it no matter the temp. I assume I need to adjust some carb settings but unsure as to what. Any ideas?

 

Turn the air/pilot screw's in (clockwise) until they seat, then turn back counterclockwise 2 1/2- 3 turn's out.......

 

YES, Stakk is correct. As per his recomendation to me it worked wonders @ 2.5 turns in north GA.
I will add that if your popping is durring engine breaking when the throttle is shut, your idle may be too low starving the motor for air. Bump it up a little bit.

 

Cool, I'll try that. Thanks. I don't have any popping during braking only at idle. I'll let you know.

 

Well I checked it out and the rear carb was at 2.75 turns out and the front was at 1.5 turns out. That was set at the store and is the way I have been running it. I changed this to 2.5 turns out front and rear. So by turning it in vs. out, which way is giving you more air? In or out? Out I would believe.

Thanks...

 

Out is richer=more fuel....In is leaner=more air, having them the way they were was probably throwing the carb sync off, stock is 2 1/4 turns out, 2 1/2 turn's out is a hair richer, should be fine there.....

 

Make sure both of your carb boots are sealed tightly to the carbs.