It's the time of year for testing bikes it seems. On the commute this morning the bike began to feel flat at 4200rpm upward. It did this in 4th and 5th. It was especially noticeable on a steady throttle. There was plenty of go if I opened the throttle fully but on a steady throttle it feels like it wants to die but isn't hunting or cutting out. Bike idles fine. Brakes don't seem to be dragging. Chain is adjusted fine and in good condition as are Cush drive rubbers.
Weather is pissing wet.
Thoughts?