Aprilia use DLC on the intake buckets on the previous gen engines and on the intake, exhaust buckets on the new engine as well as the gearbox in certain spots.
If you buy the Aprilia Racing SBK 1 ring pistons, you get it on the pistons too - the ENTIRE piston!
The CRT/MotoGP engine uses it on the camshafts and alot of the rotating engine parts inside to reduce friction
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Here is a very rare photo inside a non gear drive CRT engine, billet aluminium cylinder heads and as you can see - DLC Coated fancy Camshafts
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