Measuring The Compression Pressure - Yamaha YFM7FGPW Service Manual

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

b
a
c. Visually check the stationary pointer a to
verify it is within the required firing range b
indicated on the AC magneto rotor.
Incorrect firing range → Check the pulser
coil assembly.
NOTE:
When checking the ignition timing, make sure
that the timing light cord does not come in con-
tact with the exhaust muffler.
d. Install the timing mark accessing screw.
Timing mark accessing screw
6 Nm (0.6 m · kg, 4.3 ft · lb)
L LLL L LLL L L LLL L
4. Detach:
• timing light
• tachometer
5. Install:
• footrest board
Refer to "FOOTREST BOARDS".
• right side panel
• left side panel
Refer to "SEAT AND SIDE PANELS".
EBS00061
MEASURING THE COMPRESSION
PRESSURE
NOTE:
_
Insufficient compression pressure will result in
a loss of performance.
1. Measure:
• valve clearance
Out of specification → Adjust.
Refer to "ADJUSTING
CLEARANCE".
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• right side panel
Refer to "SEAT AND SIDE PANELS".
• V-belt cooling duct 2
Refer to "ENGINE REMOVAL" in chapter 4.
3 - 25
CHK
ADJ
L LLL L L LLL L L LLL L LLL
THE VALVE