Page 64 of Kawasaki Motorcycles by Kawasaki USA

Each 4-valve head uses a single, centrally located, irridium plug fired by high-voltage coils for high combustion efficiency. Cylinder heads use a large 35 valve angle, to provide a low engine profile (intake valve diameter: 40 mm; exhaust: 36 mm). Hydraulic valve lash adjusters are located on the rocker arms, and high-quality SKD tappet material is used for low weight and high durability. Twin chain-driven cams operate the pushrods that run along the exterior of the cylinders on the right side of the engine. An automatic, ECU controlled electric solenoid decompression system makes starting easier. When the decompression system is activated, the exhaust valves are held partially open to release some cylinder compression to allow easier starting of this big engine.

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