Got this problem with a TDR 250 I bought in Germany... The bike has covered about 75,000 miles (!!!). I've fitted DEP silencers. I've had the stator checked and repaired and I have changed the spark plugs. The bike flies from 5-6thou on... But it is hesitating at low revs. The repair on the stator has made things better but it is still there. I've noticed now that the left hand silencer (coming from the exhaust of the front right hand barrel) is very oily! The other silencer looks normal... Coils? Carbs? Any suggestions? Thanks in advance!
the choke cables were stuck on mine also check the orange wire is tight on the coil connection
The crankcase seal could be opening up when it gets warm. The fact that it gets worse when it gets warm points to either the stator overheating or the jetting leaning out. I'd have the carbs apart and keep an eye on the gearbox oil.
Thanks to all of you for the information. I'll check the carbs first. Didn't touch them yet to be honest... Will need a TDR 250 manual. The original ones are hard to find unfortunately....