Usualy either cold or around 190 degrees my bike with make a ticking noise in relation to RPM. Its not loud enough for the car next to me to hear it, It doesnt affect performance, or ridability. What is this noise? valves? lifters? I have a Suzuki GSX-R600 with 15000 miles on it. Always taken care of had a full service about 3000 miles or so ago. My last bike did this to '99 R-6 with about the same mileage.