Hi guys. Well, I took everbody's suggestions trying to track down that chain-like slapping noise within my 426. Everything looks great on the just under the surface. 1st - I've had everybody who's anybody listen to it including a coupla bike mechanics. No idea - maybe a piece of clutch floating around, cam chain.... The noise is intermitant at idle - just a little rattle every second or 2. I had one mechanic ride it - I could hear it as he was slowly accelerating away; he looked back at me & immediatley turned around & came back. It's pronounced. And it doesn't matter whether the clutch is in or not. The clutch is very grabby, but had plenty of oil, no dry plates at all. I've pulled the clutch & basket. Plates are fine, all clutch plates are within spec & none are damaged. The gears & such behind look like a new baby's bottom. Perfect. Pulled the ignition cover off & strained oil thru a paper towel. Every thing looks fine & nothing in the oil. Pulled valve cover off & valves are within spec to the tight side. Cam chain looks fine, when I rotate the engine & move it back & forth I can see no slack in it. Shine a flashlight down & bottom gear looks ok, chain is tight against adjuster. The front of the chain though is riding the slider all the way down, it doesn't look loose or out of place, but it is definately maiking the chain belly in a little. Any more ideas? I talked to the mechanic at my dealer & he's never had a 4 stroker apart ("Geeze, I've never heard of anyone having a problem w/ a 400/426") But he's real interested in checking one out... I'd rather it not be on mine! Does Yamaha have a question/answer websight or anything? Thanks!