Cylinder Head - Yamaha WaveRunner FX140 Service Manual

CYLINDER HEAD

The cylinder head is based on the YZF-R1 for a compact design.
DOHC with 5 valves (intake: 3, exhaust: 2) per cylinder accomplishes a high combustion ratio and
high performance.
A timing chain drives the intake and exhaust camshafts and a timing chain tensioner provides the
optimum tension of the timing chain at all times. As a result, the camshafts open and close the
valves with optimum timing.
A cam position sensor is installed to the cylinder head cover of cylinder #4 to distinguish each cylin-
der and to control the engine more precisely.
Fig. 3
3