Yamaha FX10X Service Manual page 76

COMPRESSION PRESSURE MEASUREMENT
1
COMPRESSION PRESSURE
MEASUREMENT
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
• Valve clearance
Out of specification → Adjust.
Refer to "VALVE CLEARANCE ADJUST-
MENT".
2. Start the engine, warm it up for several minutes,
and then turn it off.
3. Remove:
• Fuel tank
Refer to "SEAT AND FUEL TANK" in CHAP-
TER 5.
4. Remove:
• Spark plug
CAUTION:
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumulated
in the spark plug wells to prevent it from falling
into the cylinders.
5. Install:
• Compression gauge 1
Compression gauge:
90890-03081
Engine compression tester:
YU-33223
2-18
INSP
ADJ