have a 2000 XT 350, it idles good and runs well under load......starts good too, but when your cruising(little load on engine) it feels like its missing......some times I'll pull the choke out a little and it smoothes out.....running to lean?? this bike gets 65-70 mpg. I'm taking it to a shop and have them look at it .....what do ya think???? THANKYOU!!!!