Alright, I have a loud knocking sound. It gets louder when you rev the bike. I have already replaced: cylinder, piston and rings, exhaust cam, buckets, cam chain and guides. All of these needed replacing. As soon as you start the bike, the sound begins, once the choke is off its not so loud, but when you rev the bike, it gets louder. I have the motor broke down, the only thing I have left to do is split the case, which I really don't want to do. I have a good mechanic doing the work, we are just out of ideas. Please help. Its been way too long since I have rode my bike.