Yamaha WR450F User Manual download pdf (Page 4)

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WR450F

5-valve cylinder head benefits:

1. Excellent “breathing” efficiency (increased valve area improves intake & exhaust flow)

2. Allows a higher rpm limit because smaller, lighter valves have less risk of valve float

(valve float is one of the determining factors in setting a redline

3. Excellent power delivery

4. Reduces cam wear

5-valve combustion chamber design with optimized port shapes for

excellent flow characteristics. The 5-valve design features 3 intake

valves and 2 exhaust valves.

Lightweight titanium valves (intake & exhaust) and load-reduced valve

springs reduce reciprocating mass by up to 40% over conventional steel

valves.

5- Valve Cylinder Head

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Yamaha WR450F User Manual Page 4