3 - 28
CHK
ADJ
MEASURING THE COMPRESSION PRESSURE
1. Remove:
• footrest board (left and right)
• inner fender
Refer to “SIDE COVER MOULDINGS AND
LEG SHIELD”.
2. Measure:
• valve clearance
Out of specification → Adjust.
Refer to “ADJUSTING THE VALVE
CLEARANCE”.
3. Start the engine, warm it up for several min-
utes, and then turn it off.
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 1
7. Measure:
• compression pressure
Out of specification → Refer to steps (c)
and (d).
Compression gauge
90890-03081, YU-33223
Extension
90890-04082
Compression pressure
at 360 r/min (at sea level)
Minimum
1,200 kPa
(12.0 kg/cm
2
, 170.7 psi)
Standard
1,400 kPa
(14.0 kg/cm
2
, 199.1 psi)
Maximum
1,570 kPa
(15.7 kg/cm
2
, 223.3 psi)
To Next Page