Checking The Wire Harness (Yum2E); Checking The Brake Cables; Checking The Shock Absorbers; Checking The Fuel Hose (Yum1A/Yum2A) - Yamaha UMAX Service Manual

2. Remove:
• Spark plug
Refer to "CYLINDER HEAD AND ROCKER
ARMS" on page 5-6.
NOTICE
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from falling
into the cylinder.
3. Check:
• Spark plug type
Incorrect → Change.
Manufacturer/model
NGK/BPR4ES
4. Check:
• Electrodes "1"
Damage/wear → Replace the spark plug.
• Insulator "2"
Abnormal color → Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
• Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• Spark plug gap "a"
(with a wire thickness gauge)
Out of specification → Regap.
Spark plug gap
0.7–0.8 mm (0.028–0.031 in)
7. Install:
• Spark plug
Spark plug
20 N·m (2.0 kgf·m, 15 lb·ft)
TIP
Before installing the spark plug, clean the spark
plug and gasket surface.
8. Connect:
• Spark plug cap

CHECKING THE WIRE HARNESS (YUM2E)

1. Check:
• Wire harness
Cracks/frayed/corrosive → Replace.

CHECKING THE BRAKE CABLES

1. Check:
• Brake cables
Cracks/damage → Replace.
• Brake operation
Improper operation → Adjust the brake.

CHECKING THE SHOCK ABSORBERS

The following procedure applies to all of the
shock absorber assemblies.
1. Park the vehicle on a level surface and apply
the parking brake.
2. Check:
• Shock absorber assembly
Refer to "CHECKING THE FRONT SHOCK
ABSORBER ASSEMBLIES" on page 4-34
and "CHECKING THE REAR SHOCK AB-
SORBER ASSEMBLIES" on page 4-38.
• Operation
Pump the front shock absorber assembly up
and down several times.
Unsmooth operation → Replace shock ab-
sorber assembly.
Refer to "FRONT SUSPENSION COMPO-
NENTS" on page 4-32 and "REAR SUS-
PENSION COMPONENTS" on page 4-36.
CHECKING THE FUEL HOSE (YUM1A/
YUM2A)
1. Check:
• Fuel hose
Cracks/damage → Replace.
Loosen the connector → Connect properly.
3-11
6-MONTH CHECKS