Im rebuilding my neighbors carb. Its a Quadrunner 160. Think it was a 01. I cleaned the carb with an ultrasonic cleaner and reassembled with a rebuild kit. I adjusted the needles back to their settings prior to cleaning it. I have never worked on a carb that has a choke like this. I dont understand what that plunger on the carb is. What does it do for the choke? The fourwheeler will either idle too low then bog down when i gas it or too high and shifts hard in 1st or reverse. I cant find a happy medium. How do i go about adjusting this properly? Ive never had a hard time adjusting a carb before. BTW the needles are side by side. Im assuming the idle air is on the engine side? Help haha

Thanks, Jason

 

im guessing you get a decent idle for a little bit but then it settles down too low and eventually dies. and if you bring the idle up it stays steady but is way too fast, right? i had that prob on my 230...

sounds like you need to play with the pilot/idle air bleed. just remember, going in makes the mixture richer, and out makes it leaner. this circuit effects the idle to 1/4 throttle range btw. that screw is located closer to the airbox.

the revving issue can be solved by playing with the clip position on the needle.

oh and the choke circuit simply opens up a "bypass" for the air (the air inlet is one of the little holes you see inside the carb around the rim before the slide when looking down the venturi) it allows the air to go "under" the slide (well, actually under the entire venturi) and puts it into a little mixing chamber where it atomizes fuel and then gets spit out after the slide. the choke only works with the throttle completley closed as it needs vacuum behind the slide.