Measuring The Compression Pressure - Yamaha XVS1300A 2007 Service Manual

Manuals by Motomatrix / www.motomatrix.co.uk / The Solution For Lost Motorcycle Coded Keys
3. Connect:
• Timing light "1"
• Digital tachometer
Timing light
90890-03141
Inductive clamp timing light
YU-03141
4. Check:
• Ignition timing
M MMM M MMM M M MMM M
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
Engine idling speed
950–1050 r/min
b. Check that slot "a" in the generator cover is
within the firing range "b" on the generator ro-
tor.
Incorrect firing range → Check the ignition
system.
email: info@motomatrix.co.uk
2
1
3
1
M MMM M M MMM M M MMM M
b
a
NOTE:
The ignition timing is not adjustable.
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5. Install:
• Timing mark accessing screw
(along with the O-ring
• Damper
• Damper cover
Timing mark accessing screw
Damper cover bolt
6. Install:
• Front cylinder covers
Refer to "ENGINE REMOVAL" on page 5-1.
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-
MMM
ANCE" on page 3-3.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Front cylinder covers
• Rear cylinder covers
Refer to "ENGINE REMOVAL" on page 5-1.
4. Disconnect:
• Spark plug caps
5. Remove:
• Spark plug
ECA13340
CAUTION:
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"
3-9
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New
)
6 Nm (0.6 m·kg, 4.3 ft·lb)
7 Nm (0.7 m·kg, 5.1 ft·lb)
ENGINE
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