I recently acquired a 1992 Lt-250 4WD with 6000KM. I've only put 12 KM on it. It starts very easily, but after riding it for about 3KM it won't idle and quits. Its a little hard to restart and requires a faster idle speed to keep going. If I don't keep the idle speed up it quits. It is then a little harder yet to restart. It then seems to need a yet faster idle speed to keep going and if not maintained will quit again. Etc, etc, etc. To the point that I'm afraid of killing the battery and / or the starter.

After cooling down it restarts easily. (And repeats.)

It is supposed to have a newly serviced carb, and I've drained and put in clean fresh fuel. I have the cooling fan turned on.

I've gone through Clymer's Service / Repair / Maintenance manual and can't seem to find anything that addresses the problem.

I don't know anything about its history.

 

check the plug. Is it leaning out or richening up?

is the exhaust plugged up?

also...is the exhaust pipe getting red hot?

 

Make sure that the fuel tank vent hose is not clogged or kinked.

 

Thanx fellows, just got back from a test run. Rode about 8km without a problem. I replaced the plug (old one was only slightly carboned up), changed oil and filter, put in a new air filter, and checked out the exhaust - seemed to be OK - but managed to damage the muffler trying to get the seized up plug out (even with lots of penetrating oil). --- Maybe the new hole in the muffler contributed to the quad running well??? Fuel vent hose was fine.

Thanx again
Richard