I have a cl100 that I built over the winter. Because it was a budget build I scuffed the cylinder with 220 grit wet paper and replaced the rings. I also replaced all the gaskets and seals, new clutch and some other stuff. It ran ok during break in and just smoked a little - light haze like a rich running bike almost. During a top speed run yesterday it lost power dramatically at about 60 mph, when I stopped it was smoking. The next day on start up it smoked heavily for about 5 minutes then ran well with just light smoke. Yesterday on a longer ride it lost power gradually like it was climbing a hill that was not there. When I stopped it idled down and died. After sitting for a minute or two it started and ran like it always did. It did this twice on the way home too - after about ten miles it would begin to act up. After the top speed issue I rechecked everything, gapped and timed the new points, checked the valves, raised the clip one notch as it was a bit lean, charged the new battery again. My guess is that I broke a ring during speed trials. I think I need to take the top end apart to get a real answer but the power loss has me baffled. Any ideas? Are the smoking issue and power loss the same? It seems to run fine otherwise and revs up to redline in every gear. Sorry for the long winded post and here are some pics for those of you that hung in there all the way through.