Did the coolant change on the Hayabusa today and was presently surprised when I didn't see any sign of corrosion what so ever inside the radiator. The Dex-Cool was in there little over 10 years (yeah, crazy), but the mileage on it wasn't very much, ~2000 miles.
I did however see a few little chunks of what looked like black rubber in the bottom of the drain pan, so something that's rubber in contact with the coolant is degrading. I'm thinking it might be rubber coating on the edges of the head gasket ... don't really know for sure. The rubber on the radiator cap looked good, so it wasn't that. Or maybe it's some RTV type of sealant that was used during assembly at the factory? Not really concern at this point. Also saw what looked like tiny shavings of aluminum. Not sure what that could be except maybe the water pump is shaving its housing a little bit? The water pump bearings shouldn't be bad, the bike only has 15K miles on it.