Hi,everyone my name is Terri.I have a problem.I have a 1995 Yamaha ,250 Timberwolf.When I let the 4-wheeler idle it makes a coughing sound and eventually dies.What could cause this problem?

 

Dirty carb, partially plugged low speed jet, idle not set high enough. Does it run okay once it's above idle speed?

 

It runs okay if the choke is halfway on.Coughing occurs when the choke is off and I can only keep it running if I press the accelarater.

 

Sounds like it's time to pull the carb and give it a good cleaning.

 

Thank you for the help.I have cleaned it once ,recently.I am going to ckeck the float adjustment.

 

I think that carb has a spring loaded tip for the float valve. You should take a look at that to be sure it's moving freely.
When I got my Warrior last month it was running pretty lousy from sitting with stale gas. I drained the gas and it still wasn't running well. When I pulled the carb off and checked it the tip was stuck on the valve. I sprayed it and got it moving again, put the carb back together and it fired up and has been running fine since. I did check the float height on it and it was right in the middle of the specs.
Like you said, it's a good thing to check with it running like you described.
I had a Timberwolf back in '96. With a set of Mud Machines on the rear it went about anywhere the 4x4's did, and had a lot better splash protection than the Wolverine!
Hope you get it figured out, sounds like you're on the right track.

 

Thank you.I will check it tomorrow.Thanks a bunch!

 

check your airfilter too, i used to have a twolf and it ran really really bad when the airfilter was a bit dirty...

 

i had a 96 that started doing the same thing i moved the clip up 3 on the jet and it cleared up give it a try.

 

Hey you guys ,I have checked everything and nothing worked.I cleaned the carb.,I checked the jets,and the float.I have even checked the filter.This Timberwolf is still coughing and dieing !!!!!!Do you guys have any more suggestions?Please help,please................