I have a 93 timberwolf that will start fine, but no matter where the idle screw is, it wants to idle at 'full throttle', yet will still rev up quite a bit when the throttle is advanced. The air filter is falling apart and I plan on replacing it, but I cant say I have run into any type of quad idling so dramatically different just by having the filter off. Is there anything else I can try or something that I am missing? New needle put in, carb is spotless, nothing is sticking, just idles extremely high. Any help would be greatly appreciated.

 

either your choke is stuck or your throttle is stuck

 

IT'S running really lean have you adjusted the air/fuel mixture screw?I ran into the same problem a year or so ago with a bayou 300.. An by the way welcome to the forums.

 

Thanks for the welcome. Took a while to find a decent forum for ATVs on the web. Anyway, yeah, checked the Air/Fuel screw and tried playing with it. Took the carb apart again, slapped in the new needle set, cleaned everything again, made sure all the jets were clear, slapped it back in, and now it doesnt even want to start at all. Pops and runs for a second or two with starting fluid but thats about it. Are replacement carbs fairly inexpensive or is there anything else I should think about trying? Otherwise, I am completely stumped. Think it might be time for the shop to take over.

 

Where is the fuel mixture screw set at? It should be around 2 turns out from bottomed.Its posible the idle speed screw is set too low.
With out an air filter installed, and if the air lid is off, itll be very lean, and could be very hard to start. At least keep the air box lid on, to richen it up.
The slide was probably hung up, at first, and that caused the high rev. Make sure it goes all the way down in the bore. Make sure the rubber piece that the carb connects to, and goes to the motor, isnt ripped or cracked, and allowing air to lean things out.

 

The body of the Carb joint (the rubber piece) was one of the first things I thought of after checking the slide. Outside looks good, no cracking, tears, or worn spots. Although now that I think of it, I seem to remember there being an o-ring between the motor and the joint that I didnt check this time around. Did replace the o-ring on the carb though, even though it looked perfect. As for the mix screw, it was set at about 1 3/4 turns out. Ive been playing with it from anywhere between 1/2 to about 3 turns out, and still cant get it to start. Also been playing with the idle set screw. Makes no difference. Everything is back on, Airbox cover, etc. When I was able to get it on high rev, I was able to see in the carb through the airbox with an inspection mirror and see that it was fully at the bottom of the bore. Think its time for the shop to take a look if that o-ring in the joint and a new air filter doesnt do the trick. In any case, I really do appreciate the help thus far. Another thing that Im not worried enough to start a new thread on is the starter will usually catch right away, but after a second or so, sounds like there is a missing tooth in there and starts grinding. Let up on the starter, hit it again, and it catches right away for a second. Took the crankcase cover, stator, and idler gears off, teeth look fine, no cracked, chipped, or overly worn teeth on anything. Anyone run into any similar problems? Not the end of the world, just a little annoying when you cant let the starter run for a good 5-10 seconds trying to get it to start. ;-) Again, thanks for the help so far.