Having a problem with a recently acquired XR80. Had similar problem with my new DRZ. I'll explain:
Brand new bike, wouldn't stay running with choke let all the way out. I took the bike back to the dealer, they drilled out something, and it's been fine since. They said the problem was poor fuel (10% ethanol crap).
I picked up a used bike for my wife. Went and test rode it & it ran just fine. Next time on it (day later), bike wont keep running if I turn choke all the way off.
I added, fuel stabilizer to it, and let run with the choke 1/2 on for 5-10 mins. I turned the choke all the way off, and it cut off.
Don't know anything about working on bikes, but willing to try and learn. PLEASE ADVISE ASAP.