Measuring The Compression Pressure - Yamaha XVZ13TF 1999 Service Manual

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

3. 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
950 X 1,050 r/min
b. Check that the stationary pointer a is within
the firing range b on the generator rotor.
Incorrect firing range ! Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
4. Remove:
S timing light
S engine tachometer
5. Install:
S timing plug 1
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. Check:
S valve clearance
Out of specification ! Adjust.
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE".
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Disconnect:
S spark plug cap
3-19
CHK
ADJ