Page 168 of Kawasaki Motorcycles by Kawasaki USA

Lightweight, high-performance titanium valves ensure accurate valve timing even at maximum engine speed. Oxide membrane treatment resists wear. Aluminum valve spring retainers reduce reciprocating weight for reliable valve control at high-rpm. Double valve springs also help ensure stable valve operation and allow a short cylinder head height. Asymmetrical high-acceleration cams improve intake efficiency. The camshaft lobes and tappet surfaces feature a soft-nitriding surface treatment for long wear and high-rpm reliability. Exhaust: 31 mm Intake: 36 mm Exhaust Intake

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