gremlins
actually I like to take them a little higher than where I normally cruise to clean the cylinder walls.
I was a bmw/ducati shop guy awhile back and the Ducati engineers showed where cylinders would build up material on the cylinder walls when run at constant rpm over a period of time(like suburbanites buying an italian racing bike to cruise the interstate and to the local watering hole.
So what they recommended for us was once the engine was at normal operating temperature to get the engine rpm over where they would normally be for short periods of time each time you operated it to clean the cylinder walls(probably the rings as well).
I have done it ever since and my cylinders stay nice and clean.
