Used 18hrs. Excellent Condition. Removed to sell the bike as mostly stock. DCR Billet , adjustable timing, S-4 In/Ex cam set. With a manual cam chain tensioner. Zero wear or damage. OEM springs and piston can be used. Owner is responsible for confirming correct timing, and all proper clearances. I can provide guidance. But proper installation is the responsibility of the assembing technician. 2 base gaskets were used to create adequate ex valve to piston clearance as timed now.