Just picked up my new 03 Trailboss.
This thing won't idle while cold for anything.
I've let it run, and driven it around for 10 minutes, and it still stalls out when I let
go of the throttle.
Any ideas?

 

Have you tried to turn the idle up? Or i dont know if it could be the jetting but have you jetted it for the cold?

 

My 2004 model is lame when cold too. The trick is to use the choke (and throttle) until it warms up before you ride. Each machine is different and you'll have to learn what choke settings work best for you. 3/4 choke at first, then less and less as it warms works for me. Mine takes about 5 minutes, then it runs like a charm all day. Good luck.

EW

 

These are notorious for cold running issues. The best thing for it is to raise the needle. Do this by lowering the clip one position on the slide needle. You must remove the top gold round plate on top of the carb, then pull the slide out. Your dealer should do this for you. Also you can adjust the pilot screw on the bottom of the carb, but you have to drill the brass epa plug out first.

 

i've got a trailboss 325 and it runs like a charm all year. always starts and with apropriate choke if its cold it will idle forever. i would think choke and idle speed is all you need to do on that baby

 

I adjusted the idle speed by turning in the black **** on the bottom of the carb.
It will now idle.
Before, I had to hold the throttle in slightly just to keep it running no matter where the choke was set.
I guess the dealer lied when he said it went thru their shop, and was all set to go.

Being March, should I re-jet, or just wait til next fall.

PS. this Quad is much nicer to ride than my old Bayou 220!

 

You shouldn't have to rejet at all.

 

Just came back from a long ride.
It idles fine now, thanks for the advice!