Measuring The Compression Pressure - Yamaha YP250R 2005 Service Manual

MEASURING THE COMPRESSION PRESSURE

EAS00067
MEASURING THE COMPRESSION
PRESSURE
NOTE:
Insufficient compression pressure will result in
a loss of performance.
1. Remove:
• storage box
2. Measure:
• valve clearance
3. Start the engine, warm it up for several min-
4. Disconnect:
• spark plug cap
5. 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.
6. Install:
1
• compression gauge 1
3 - 19
Refer to "COVERS AND PANELS".
Out of specification → Adjust.
Refer to "ADJUSTING
CLEARANCE".
utes, and then turn it off.
CAUTION:
Compression gauge
90890-03081
CHK
ADJ
THE VALVE