I just got my 07 Victory Hammer back from the shop. Got an oil change, New plugs, check all and when I took it from the shop it is running totally different. It seems sluggish and like the motor is restricted. It was purring like a kitten since I bought it 5 months ago! The shop mentioned that I had what sounded like an exhaust valve sticking in front cylinder but didn't think anything of it cause it seemed to run fine when I dropped it off. It has something definitely wrong! Please help me figure this out. Any Ideas????