Yamaha MT-01 T 2005 - Measuring the Compression Pressure

ENGINE
3-9
1. Stand the vehicle on a level surface.
2. Remove:
• Air duct “1”
• Timing mark accessing screw “2”
3. Connect:
• Timing light “1”
• Digital tachometer
4. Check:
• Ignition timing
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a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
b. Check that pointer “a” on the clutch cover is
within the firing range “b” on the crankshaft
position sensor.
Incorrect firing range → Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
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5. Install:
• Timing mark accessing screw
• Air duct
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:
• Seat
Refer to “GENERAL CHASSIS” on page 4-1.
• Fuel tank
Refer to “FUEL TANK” on page 6-1.
4. Disconnect:
• Decompression solenoid couplers “1”
Timing light
90890-03141
Inductive clamp timing light
YU-03141
Engine idling speed
850–950 r/min
1
2
1
T
R
.
.
Timing mark accessing screw
8 Nm (0.8 m·kg, 5.8 ft·lb)
T
R
.
.
Air duct bolt
10 Nm (1.0 m·kg, 7.2 ft·lb)
Air duct bracket bolt
7 Nm (0.7 m·kg, 5.1 ft·lb)
a
b