V-Belt Inspection; Compression Pressure Measurement - Yamaha XC125 Service Manual

[INSP V-BE,T
INSPECTION/
_, COMPRESSION PRESSURE MEASUREMENT
i V-BELT INSPECTION
1. Remove:
• V-belt check window plug (_
(from the left side crankcase cover)
2. Inspect:
o V-belt (_
Damage/Crack/Wear/Chipping -+ Replace.
Oil/Grease -* Check sheaves.
(Refer to page 3-27)
COMPRESSION PRESSURE MEASUREMENT
NOTF"
Insufficient compression pressure will result in
__ performance loss.
1. Remove:
• Side cover (Right)
® Valve covers (Intake/Exhaust) (_
2. Measure:
• Valve clearance
Out of specification -_ Adjust.
3. Warm up the engine for a few minutes, and
stop it.
4. Remove:
......... "........... • Spark plug
5. Measure:
® Compression pressure
By the following measurement steps.
Compression pressure measurement steps:
® Install the Compression Gauge (YU-33223)
Q using an adapter.
• Crank over the engine with the electric
starter (be sure the battery is fully charged)
with the throttle wide-open until the com-
pression reading on the .gauge stabilizes.
• Check readings with specified levels (See
chart).
Compression Pressure (at sea level):
Standard:
882 kPa (9 kg/cm =, 128 psi)
Minimum:
785 kPa (8 kg/cm =, 114 psi)
Maximum:
1,079 kPa (11 kg/cm =, 156 psi)
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