Sounds like soft metal parts in the top end. Yamaha had a similar problem with the Raider engine. Bad lifters or cams maybe. Not to worry. Most likely you will get new heads and all hardware. If you want to turn lemons into lemonaid now would be the time to get a BB 1700 kit installed while they pick up the tab for labor. You might even look into getting the heads ported & polished.
Last edited by BMK9251; 02-20-2012 at 11:41 AM.