so i have 2 motors aprart at the moment. I measured the volume on one of the motors heads (aprilia sxv 5.5) it was a little difficult with the water i used running out one of the exhaust vavles note the camshaft was not installed at this point. i removed the valves seats look good, valves look good. except the massive build up which weighs probably 1/3 the weight of the valve So, i believe these valves are coated with DLC. they are shiny black on the stems i hear the ti valves come in several flavors raw titanium - generally not for us motorcycle guys more for uninformed road racers and paved circle track guys dlc coated - black, good stuff? Ti ni coated - gold, and good stuff? Molly coated stems, dull grey? and also titanium oxide (anodized ti) ive gatered dont, spray chlorinated cleaners on the molly coated stuff, I have set of ti rods for the dirt stock car they have molly coated thrust surfaces and they are a nice flat grey my valves dont look like this so before i read anything about all this i know do not grind or abraid your ti valves as youll ruin your dlc, or ti ni, so i used brake cleaner and carburetor dip to no avail read about not using chlorinated cleaner and about pooped my pants!! then though that it was redicilous since im 90% sure they are dlc coated and not molly. i thenn watched a pro circiut video with a guy chucking them in a drill and polishing them up with some red scotch brite and wd40?? can i do this to dlc valves? what do you guys do?