Service manual

5-4
E
POWR
ENGINE UNIT
SERVICE POINTS
Compression pressure measurement
The following procedure applies to all of the
cylinders.
NOTE:
Insufficient compression pressure will result in
a loss of performance.
1. Measure:
• Valve clearance
Out of specification
→
Adjust.
Refer to “POWER UNIT” in Chapter 3.
2. Warm the engine up, and then put the
watercraft in a horizontal position.
3. Remove:
• Air filter case cover
1
• Air filter element
4. Disconnect:
• Spark plug cap
5. Remove:
• Spark plug
CAUTION:
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug wells to prevent it
from falling into the cylinders.
6. Install:
• Compression gauge extension
1
• Compression gauge
2
Compression gauge extension:
90890-06582
Compression gauge:
YU-33223-1/90890-03160
2
1