This has been driving me nuts because there's no way to determine what it causing this. After running at 75mph for about 20 minutes, the motor loses power and feels like 1 or 2 cylinders shuts down. Back off the throttle for awhile and they come back in. This only happens when crusing around 75mph or higher. It clears up when you slow down so theres no way to figure out what is causing this. I have a '99 Trophy 1200 with 8k miles. Sound familiar to anyone?