Measuring The Compression Pressure - Yamaha MIO Service Manual

MEASURING THE COMPRESSION PRESSURE

1
CHECKING THE SPARK PLUG/
10.Install:
• center cover
• seat
EAS00067
MEASURING THE COMPRESSION
PRESSURE
NOTE:
_
Insufficient compression pressure will result in
a loss of performance.
1. Measure:
• valve clearance
2. Start the engine, warm it up for several min-
3. Disconnect:
• spark plug cap
4. Remove:
• spark plug
_
Before removing the spark plug, use com-
pressed air to blow away any dirt accumu-
lated in the spark plug well to prevent it
from falling into the cylinder.
5. Install:
• compression gauge 1
3 - 14
Refer to "INSTALLING THE SEAT AND
SIDE COVERS".
Out of specification → Adjust
Refer to "ADJUSTING
CLEARANCE".
utes, and then turn it off.
CAUTION:
Compression gauge
90890-03081
CHK
ADJ
THE VALVE