ashman

Hey. I have just bought a 95' xjr400, all was ok but the other day one of the cylinders seemed to be cutting in and out, that has now stopped, but today my friend was following behind and he said there was a real stink of burning oil and alot of blue smoke. Befor I bought the bike it had basacily been sitting for a year and a half, iv had it just over a week now. What do you lot think could be wrong, maby a a stuck or broken piston ring? Cheers for any help.