Hi, I have an 2003 Ozark 250 and have been having trouble with the engine stalling and running rough at idle. My wife drives it and it stalls constantly on her. When I drive it I can keep it running but have to goose the throttle when it feels like its going to stall. It seems to occur only in the winter though, throughout the summer it seemed ok. We had it out on the ice this past weekend, a temperature of about 15 degrees out. When it stalls it is difficult to start. I raised the idle but it didn't help. If the machine just sits there after you get it running its ok. Only has the problem if you ride it a while. I was thinking maybe there is a carb adjustment or something I can do to improve this condition. I would take it back to the dealer however unless they ride it the problem will not show up. Thanks Bob

 

turn up your idle a little, make sure it warms up pretty good before you ride it. My Z250 has been having the same problems, it dont like the cold

 

u both need to let it warm itself up with the choke on until it starts to idle like crap from the choke being on then turn the choke of and it is ready- like the bike will idle back down after it gets warm then turn it off

 

Like most quads sold in the States they are way lean to pass emmissions requirements.
Ours is very cold blooded and needs a good 5 minutes to run right. Choke on and fire it up, then walk away and put your gear on, by then it will run fine. I'm thinking of rejetting it to see if it helps, It helped alot on my KFZ400!! One more thing to try, put the fuel petcock in "prime" position and try it out, Suzuki has a Vacuum operated petcock that will only flow fuel when engine is running and vacuum is present at the valve. If it takes care of the problem look for a loose or kinked vacuum line from the intake manifold to the fuel valve. Also there could be a freezng problem restricting the vacuum, so after you let it sit for a while it flows a little more fuel into the carb.

Bob J

 

mine did the same thing njbob, it ran good for a few minutes and then it decided to start cutting out on me. i decided that i should park for the night, because it was 25 degrees, and then let it warm up better the next time i rode, and it hasnt done it since. I am new to this forum, i just got an ozark 250 and love it.

 

Thanks to All that replied, It seems now that it has warmed up around here to about the freezing mark the problem is less pronounced. I know when I ride it, its fine just when my wife rides it. It may be a little flaky but probly not worth the effort to try and make it "perfect" Again thanks!

 

Mine has done that only once and that was when i didnt let it warm up long enough I let it sit with the choke half way and on prime until it starts to want to stall then turn the choke off.

Make sure you guys with Ozarks or Z's leave it in prime when it is warming up then after it warm remember to turn it back to on position.

 

I think you solved your own problem. If it runs better when its warmer...then the mixture screw is too lean when its cold. Next time you ride and its reall cold...back the mixture screw out, 1/2 to 1/4 turn, that will make it richer.

 

Hi' I'd like to try the mixture screw, but I'm not sure where it is. Are ther 2 one for idle and one for high speed? And if so which is which/ Thanks Bob

 

carb pic
If you look at this picture of the carb, its #30.Dont be afraid to adjust it, just dont screw it in, with force, because if you bottom it out, you could deform it. You may have to readjust as the seasons change, its not a set and forget kind of thing. As temperatures and humidity and altitude change...so will the mixture.The idle mixture is the ony adjustable mixture screw. If the mid or top end needs adjustment, you either move a clip or a change a jet.
carb adjust
read this article and you probably wont have any problems.