New 919, Have a question on engine noise...
First of all, came from a 91 750 Nighthawk and I love the 919. One question
and hope I can explain it properly. My question is with the engine and a "spark knock" type of noise I can hear below about 4000 revs. For example, If in any gear below 3.5-4K revs and go to accelerate slightly (load engine), I can hear what I can only compare to what my small block chevy race motors with forged pistons sounded like cold, a sort of slapping noise. The bike had 5 miles on it last week when I bought it new. I noticed it at the shop when I rode it. The svc mgr said it was normal but I'd like another opinion. I don't think it's detonation and I use premium fuel. I don't think it's tappet adjustment as the noise is not constant, goes away when I let off throttle. It also seems louder when the engine is cold. Does 919 have forged pistons? Maybe it's the piston skirts? Any advise?