Hey Derek

Quote:

There's been a a few bikes with carbon buildup on the valves ...



When I had the ST in for the last recall, the #1 honcho in the workshop was telling me about carbon build-up reported on the ST engines and suggested some sorta additive they sell for it.
A small bottle added after a near-full tank fill up helps he says.
Fill the tank to near full then shove this stuff in and hey presto, everything gets a coating and all is good in the world.