ENGINE
3-11
b. Check that pointer “a” on the pickup rotor cov-
er is within the firing range “b” on the pickup
rotor.
Incorrect firing range → Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲▲▲▲▲▲ ▲ ▲▲▲▲ ▲ ▲▲▲▲ ▲▲▲
7. Tighten:
• Timing mark accessing plug
(along with the copper washer )
8. Install:
• T-bar
• Rider seat
• Right side cowling
Refer to “GENERAL CHASSIS” on page 4-1.
EAS20710
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of the cyl-
inders.
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
• Valve clearance
Out of specification → Adjust.
Refer to “ADJUSTING THE VALVE CLEAR-
ANCE” on page 3-3.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Rider seat
Refer to “GENERAL CHASSIS” on page 4-1.
• Fuel tank
Refer to “FUEL TANK” on page 7-1.
• T-bar
Refer to “GENERAL CHASSIS” on page 4-1.
4. Disconnect the all spark plug caps.
5. Remove:
• Spark plug
CAUTION:
ECA13340
Before removing the spark plugs, use com-
pressed air to blow away any dirt accumulat-
ed 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).
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a. Set the main switch to “ON”.
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
NOTE:
The difference in compression pressure be-
tween cylinders should not exceed 100 kPa (1
kg/cm², 14 psi).
T
R
.
.
Timing mark accessing plug
15 Nm (1.5 m·kg, 11 ft·lb)
New
Compression gauge
90890-03081
Engine compression tester
YU-33223
Standard compression pressure
(at sea level)
1600 kPa/400 r/min (228 psi/400
r/min) (16.0 kgf/cm²/400 r/min)
Minimum–maximum
1390–1790 kPa (198–255 psi)
(13.9–17.9 kgf/cm²)
1
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