Yamaha XP500 - Measuring the Compression Pressure

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CHK
ADJ
CHECKING THE IGNITION TIMING/
MEASURING THE COMPRESSION PRESSURE
3. Install:
• timing light 1
(onto the spark plug lead of cylinder #1)
Timing light
90890-03141, YM-33277-B
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
engine idling speed.
b. Check that the stationary pointer a is within
the firing rang b on the A.C. magneto.
Incorrect firing range → Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
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5. Install:
• timing plug
6. Install:
• left footrest board
• side cover (left and right)
• center cover
Refer to “SIDE COVER MOULDINGS AND
LEG SHIELD”.
Engine idling speed
1,100 ~ 1,300 r/min
a
b
T
R
.
.
8 Nm (0.8 m · kg, 5.8 ft · lb)
EAS00065
MEASURING THE COMPRESSION
PRESSURE
The following procedure applies to all of the
cylinders.
NOTE:
Insufficient compression pressure will result in
a loss of performance.