Is there a way to make sure the timing chain is adjusted properly? I checked the manual and it says the 2004 self adjusts.
The reason I ask is that when riding at about 55mph at a steady speed, I sometimes get an occasional roaring that sounds to me like the chain may be rubbing against something. The noise lasts about 10 to 20 seconds and appears to go away if I change throttle position. I'm baffled by the sound.
Perhaps the cooling fan cycling on/off? What's the temp gauge doing before/during/after the noise?