Well my bike loses about 5 mph. At full throttle it will get kinda throaty and speed up then cut back, speed up, drop back etc. Sometimes it stays at about 25 mph (again 5mph under) Other times it jumps up and down. My carb is imaculet, no clogs very clean. When i take my air filter out I get my 5 mph back. It's a little louder (obviousely) but runs better but eventually doesn't do too hot because it's getting too much air. My air element is new and clean, and the air box is uncloged and clean as well.
It seems my bike is starving for air. Why? Whats wrong w/ my ped!? Oh yes, I removed my muffler to find that it did the same thing (and practically lost my hearing too!)