spark plugs replace YAMAHA VMAX 2010 Owners Manual

PERIODIC MAINTENANCE AND ADJUSTMENT
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6
EAU46861
TIP

The annual checks must be performed every year, except if a kilometer-based maintenance, or for the UK, a
mileage-based maintenance, is performed instead.


From 50000 km (30000 mi), repeat the maintenance intervals starting from 10000 km (6000 mi).


Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical
skills.
EAU46910
Periodic maintenance chart for the emission control system NO. ITEM CHECK OR MAINTENANCE JOBODOMETER READING
ANNUAL
CHECK 1000 km
(600 mi)10000 km
(6000 mi)20000 km
(12000 mi)30000 km
(18000 mi)40000 km
(24000 mi)
1*Fuel lineCheck fuel hoses for cracks or
damage.√√√√√
2*Spark plugsCheck condition.
Clean.√√
Replace.√√
3*ValvesCheck valve clearance.
Adjust.Every 40000 km (24000 mi)
4*Fuel injection sys-
temAdjust synchronization.√√√√√
5*Mufflers and ex-
haust pipesCheck the screw clamps for
looseness.√√√√√√
6*Air induction sys-
temCheck the air cut-off valve, reed
valve, and hose for damage.
Replace any damaged parts if
necessary.√√√√√
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-9
6To install the panel
Place the panel in the original position,
and then install the bolt.
EAU46680
Checking the spark plugs The spark plugs are important engine
components, which should be checked
periodically, preferably by a Yamaha
dealer. Since heat and deposits will
cause any spark plug to slowly erode,
they should be removed and checked
in accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plugs can re-
veal the condition of the engine.
The porcelain insulator around the cen-
ter electrode of each spark plug should
be a medium-to-light tan (the ideal color
when the vehicle is ridden normally),
and all spark plugs installed in the en-
gine should have the same color. If any
spark plug shows a distinctly different
color, the engine could be operating im-
properly. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the vehicle.
If a spark plug shows signs of electrode
erosion and excessive carbon or other
deposits, it should be replaced.Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and replaced if
out of specification.
Clean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
1. Panel C
2. Bolt
1 2
Specified spark plug:
NGK/CR9EIA
DENSO/IU27D1. Spark plug gapSpark plug gap:
0.8–0.9 mm (0.031–0.035 in)
1
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PERIODIC MAINTENANCE AND ADJUSTMENT
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Troubleshooting charts Starting problems or poor engine performance
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the compression.
Supply fuel.
The engine does not start.
Check the compression.
Operate the electric starter.2. Compression
There is compression.
There is no compression.
Check the ignition.
Have a Yamaha dealer
check the vehicle.
Remove the spark plugs
and check the electrodes.3. Ignition
Wipe off with a dry cloth or replace the
spark plugs.
Have a Yamaha dealer check the vehicle.
The engine does not start.
Have a Yamaha dealer
check the vehicle.
The engine does not start.
Check the battery.
Operate the electric starter.4. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The battery is good.Check the battery lead connections,
and charge the battery if necessary.
DryWet
Operate the electric starter.
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