yeah man coming from a honda you're going to be hearing LOT of engine stuff on a Yamaha lol. even when my 15 was brand new it was clanky and noisy. I even thought it might be missing an exhaust gasket on the head. lol.
I think it has a lot to do with how they grind the lobes on the camshafts. there seems to be a spot the lobe doesn't touch the lifters and then it touches on the tip of the lob but also along the bottom there is always shiny spots. I guarantee these bikes open the valves when the lobe is facing up. that's why they have such huge valve clearances on a yamaha. which in turn makes a lot of noise. when I worked at the dealership that sold suzuki and kawasaki their engines had much tighter specs. and on some of the kawasaki mules I played with the spec a little. if it wasn't tight it clacked like big time. I couldn't leave them at the high end of the spec so when they tighten up with use they're more in the middle. they had to be tight or it made a noise that everyone noticed.
