Checking The Ignition Timing; Measuring The Compression Pressure - Yamaha Grizzly550 User Manual

10.Install:
• Right side panel
Refer to "GENERAL CHASSIS" on page 4-1.
EAS20700

CHECKING THE IGNITION TIMING

TIP
Prior to checking the ignition timing, check the
wiring connections of the entire ignition system.
Make sure all connections are tight and free of
corrosion.
1. Remove:
• Left side panel
• Right side panel
• Footrest board
Refer to "GENERAL CHASSIS" on page 4-1.
2. Connect:
• Timing light
(onto the spark plug lead)
• Digital tachometer
(onto the spark plug lead)
Digital tachometer
90890-06760
YU-39951-B
Timing light
90890-03141
Inductive clamp timing light
YU-03141
3. Check:
• Ignition timing
M MMM M MMM M M MMM M M MMM M
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
1550–1650 r/min
b. Remove the timing mark accessing screw
"1".
c. Visually check the stationary pointer "a" to
verify it is within the required firing range "b"
indicated on the AC magneto rotor.
M MMM M M MMM M MMM
1
3-8
Incorrect firing range → Check the ignition
system.
TIP
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 L LLL L
4. Detach:
• Timing light
• Tachometer
5. Install:
• Footrest board
• Right side panel
• Left side panel
Refer to "GENERAL CHASSIS" on page 4-1.
EAS20710
MEASURING THE COMPRESSION
PRESSURE
TIP
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
• Valve clearance
Out of specification → Adjust.
Refer to "ADJUSTING THE VALVE CLEAR-
ANCE" on page 3-4.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
• Right side panel
Refer to "GENERAL CHASSIS" on page 4-1.
4. Disconnect:
• Spark plug cap
5. Remove:
• Spark plug
ENGINE
b
a
L LLL L L LLL L LLL
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