My buddy has a 426 that was a great bike until a ride a few months ago. It started making a ticking noise when we were about 50 miles from no where. He had no choice but to ride it out or push a hell of a long ways. He made it with no problems, took it home and let it sit for a week. Then he took it out and started it and it didnt want to start. Finaly he got it started and it was running real ruff, then made some gawd afful noises and spit all this wierd crap out the exhaust. The motor went back to running normal but now makes a ticking noise. I think its the valves. HE took it into the local yamaha shop and they told him it was a normal noise for this bike. What are your thoughts on this? Any one?