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CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
1. Measure:
• valve clearance
Out of specification → Adjust.
Refer to “ADJUSTING THE VALVE CLEAR-
ANCE”.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• rider seat
Refer to “SEATS”.
• fuel tank
Refer to “FUEL TANK”.
• air filter case
• ignition coil plates
• rubber baffle
Refer to “AIR FILTER CASE”.
4. Remove:
• spark plug
• ignition coil
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.
5. Install:
• compression gauge 1
6. Measure:
• compression pressure
Out of specification → Refer to steps (c)
and (d).
Compression gauge
YU-33223
Adapter
YU-33223-3