Measuring The Compression Pressure - Yamaha XP500 2001 Service Manual

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

4. Check:
S ignition timing
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
1150 X 1250 r/min
b. Check that the mark a on the generator ro-
tor is within the firing range b on the genera-
tor cover.
Incorrect firing range ! Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
5. Install:
S timing plug
S footrest board (left)
S side cover (left)
S center cover
Refer to "COVER AND PANEL".
EAS00065
MEASURING THE COMPRESSION PRES-
SURE
The following procedure applies to all of the cyl-
inders.
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Remove:
S legshield.
S inner fender (rear)
Refer to "COVER AND PANEL".
2. Measure:
S valve clearance
Out of specification ! Adjust.
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE".
3-20
CHK
ADJ