Measuring The Compression Pressure - Yamaha 2004 YXR660 Service Manual

CHECKING THE IGNITION TIMING/

MEASURING THE COMPRESSION PRESSURE

3
2
6. Check:
• ignition timing
M MMM M MMM M
1
a. Warm up the engine and keep it at the
specified speed.
Engine speed
b. Remove the timing plug 1.
c. Visually check the stationary pointer 2 to
verify it is within the required firing range 3
indicated on the flywheel.
Incorrect firing range → Check the pulser
coil assembly.
d. Install the timing plug.
L LLL L LLL L
7. Install:
• engine cooling fan
8. Install:
• air shroud 1
9. Detach:
• timing light
• tachometer
10.Lower the cargo bed.
11.Install:
• console
• passenger seat
• driver seat
Refer to "SEATS, ENCLOSURE, HOOD
AND CARGO BED" in chapter 8.
MEASURING THE COMPRESSION
PRESSURE
NOTE:
Insufficient compression pressure will result in
a loss of performance.
1. Check:
• valve clearance
Out of specification → Adjust.
Refer
CLEARANCE".
2. Start the engine and let it warm up for sev-
eral minutes.
3. Stop the engine.
4. Lift the cargo bed up.
3 - 11
CHK
ADJ
M MMM M M MMM M M MMM M
1,450 ~ 1,550 r/min
L LLL L L LLL L L LLL L
·
7 Nm (0.7 m kg, 5.1 ft
·
10 Nm (1.0 m kg, 7.2 ft
to "ADJUSTING THE
M MMM M MMM
L LLL L LLL
·
lb)
·
lb)
VALVE