Ok... I've searched and read and searched some more then read some more. Here is my "issue": My bike developed a "noise" coming from what I think is the engine. So I went investigating. I checked valve clearance. They were a little out so I went ahead and reshimmed. Put everything back together... started up... hmm... noise still there. [i'll describe noise in a moment]. So... I was concerned about piston/rod/crank problems. So... again... top end comes off... check out the lower parts [didn't split cases or anything]. Well everything appears to be fine. Parts seem to be fitting nicely, no clanking around or anything. No loose needle-bearings. So back together it went. When I got finished it was late and a bit dark in the garage. When I started the bike... much to my dismay... noise still there and then I saw it! The red-glowing exhaust pipe! Oh my goodness I nearly lost my mind... Luckily I jumped to the web and came a searching on TT. Found out that this is not that unusual to see the red glow in the dark... still a little concerned... but hey if others are seeing it... then ok for now. Still searching for the source of this darn noise. I pulled the water pump cover off and checked the impeller out. It's in one piece [which is always nice]. However when I manipulate it by hand... I can rotate it to a stop then get a "click" in which is moves a little more. Well... it seems like the noise is not constant but it's prevelant. It sounds like a "grinding" kind of noise but nothing looks ground. It's loud and unnerving. I'm losing confidense in this little machine. I don't want to be out on a ride and get stranded, or worse be in the air and have it cut out! OUCH! Anyway... any and all suggestions would be appreciated. I'm continuing to search the forums as well as the bike itself. By the way... this noise is present sitting on the stand whether idling or reving.