Originally Posted by
opas ride
I have been riding motorcycles for over 50 years on and off and never had this issue until this last month when it was very hot and humid outside here in Michigan..As said above it scared the "hell" out of me for a while on the road I was on, which was full of "tar snakes", until I turned off and it went away...Thought for sure I was going down and the front end had come apart or something very serious...Came right home, checked the tire pressure (40) and then gave the front end a good inspection....After reading this thread, and others like it, I realized it came from the type of tire on the F6B. Others have said it comes from the big rain groove down the center of the OEM tire on the front....Now that I know this info I will make a point to avoid roads with a large number of these patches on it....although it will be a challenge as Michigan roads "suck"....Ride safe....