Surprise: Heavy Intaake Valve Deposits


Donating Member
I would appreciate any tech feedback from knowledgeable motorheads.

I am in the process of installing the full B.D.E. "Busa Package" on my `02 for drag racing and street use. After removing my air filter housing to install new plugs, I used a flashlight to look into the intake ports and was surprised to see fairly heavy deposits on the backside of several, but not all, intake valves. There were two kinds of deposits. There are dark, wet coatings (sort of like a thin layer of baked paint) that I more-or-less expected, on all valves--no big deal. But, there are also silver/white crystalline-appearing lumps here and there that are very excessive after only 3,000 miles of street use. Some of these silver lumps are obviously large enough to degrade air/fuel flow and I don't like THAT!

The bike runs okay and 1,600 of those miles came from a road trip averaging 80 to 90 MPH. The balance of recent miles have been short rides, after which, it was shut down while hot from stop-and-go city riding (it has never pinged or overheated). My theory is that the short rides are responsible for the silver deposits...!

Theory: When shut down hot, the engine quickly "heat soaks" the intake valves, elevating their temperatures, and any residual fuel from the injectors that gets on the back sides of the valves crystallizes into these silver deposits!?

This situation leaves me with the quandary of either trying a couple of cans of injector cleaner via several tanks of fuel (some mechanics swear the stuff does clean top-end deposits while others regard it as "snake oil") and have another look at the valves in a few hundred miles, or just go ahead and tear down the engine for a good head porting and Serdi valve job now (which I would rather do during the winter).    

What do you think?

nope I haven't but I have used the "Yamaha ring free" that stuff works really GOOD aswell but you have to change your oil after using it
If your going to buy a bottle of anything, then i'd agree with using the redline product (grab a botttle of their water-wetter while your at the REDLINE shelf). Chevron's TECHROLINE is a good additive to use as well, that cleans out deposits very nicely.

My personal "cocktail is misting the throttle bodies with distilled water with the engine at 2-3k, and fully warmed up. Doing this will clean the valves, piston faces, and combustion chambers to "like new" status, and doesnt require you to put any potentially "harsh" chemicals thru your fuel system. A fine mist of  distilled water sounds "too simple" but it works quickly, and safely.