Originally Posted By: 02SE
Post some pics of the rubber bits. I might be able to help identify them.
The little bits of black rubbery material would be hard to capture in a photo. Based on looking at it closely under magnification, the only place I think this material could be coming from inside the cooling system is the thin rubbery layer that's on the head gasket. The base gasket on the cylinder has the same rubber coating and can be seen from outside the engine if you look at the seam of the gasket. Of course, there is no coolant contact on the base gasket, but there is on the head gasket. Photo of an OEM Busa head gasket below.
Originally Posted By: eddy21
There's no valid reason to run Dex cool in a motorcycle. Nothing to gain lots to lose , The head gasket is layered metal , No rubber used in headgasket .
What's there to lose by running Dex-Cool in a motorcycle if it uses a metal head gasket? The only reason I ran Dex-Cool was so I didn't have to change coolant as often.
On this bike the head gasket is layered metal (4 layers), but there seems also be a rubber type material used on the gasket top and bottom surfaces. I didn't even know this until now after researching it further. See attached photos I found of the OEM head gasket. The coolant goes through all the holes around the cylinders, but makes contact with the rubbery material. I'm not totally sure if the material right around each cylinder hole is rubber or some other material, seems like rubber wouldn't last long in that location with combustion going on in the cylinders.
Hard to say if the Dex-Cool is causing this rubbery layer to degrade, or if it was the Water Wetter, or if it's just normal degradation of the material with time. There wasn't a whole bunch of material in the drain pan, but it was something I definitely noticed.
I was thinking of dropping the fresh Dex-Cool I installed yesterday and flushing the system well and going to a regular anti-freeze.