Yamaha WaveRunner GP1300R Service Manual page 192

POWR
COMPRESSION PRESSURE MEASUREMENT
1
COMPRESSION PRESSURE
MEASUREMENT
SERVICE POINTS
The following procedure applies to all of the
cylinders.
NOTE:
Insufficient compression pressure will result in
a loss of performance.
1. Start the engine and warm it up until the
engine temperature is 48 °C (118 °F).
2. Remove:
• Seat
3. Disconnect:
• Spark plug caps
4. Remove:
• Spark plugs
CAUTION:
Before removing the spark plugs, blow
compressed air into the spark plug wells to
clear out any dirt or dust that can fall into
the cylinders.
5. Install:
• Compression gauge 1
Compression gauge:
YU-33223-1/90890-03160
5-1
E