Yamaha Nmax 125 Manual

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-4
Maintenance and lubrication, periodic
EAU32125
General maintenance and lubrication chartNO. ITEM ROUTINEINITIAL ODOMETER READING
600 mi
(1,000 km)  or1
month 2,000 mi
(4,000 km)  or6
months 4,000 mi
(7,000 km)  or
12
months 6,000 mi
(10,000 km)  or
18
months 8,000 mi
(13,000 km)  or
24
months 10,000 mi
(16,000 km)  or
30
months
1 Air filter element •Replace. —— —
2 V-belt case air filter 
element • Clean
—————
3
*
Front brake • Check operation, fluid level, and for 
fluid leakage.
• Replace brake pads if necessary. ——————
4
*
Rear brake • Check operation.
• Adjust cable and replace brake 
shoes if necessary. ——————
5
*
Brake hose • Check for cracks or damage.
—————
• Replace. Every 4 years
6
*
Wheels • Check runout and for damage.
• Replace if necessary. —————
7
*
Tires • Check tread depth and for damage.
• Replace if necessary.
• Check air pressure.
• Correct if necessary. —————
8
*
Wheel bearings • Check bearings for smooth 
operation.
• Replace if necessary. ————— 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
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9
*
Steering bearings• Check bearing assemblies for 
looseness.
• Moderately repack with lithium- soap-based grease every 8000 mi 
(13000 km) or 24 months. ————
Repack.—
10
*
Chassis fasteners • Check all chassis fitting and 
fasteners.
• Correct if necessary. —————
11 Front brake lever 
pivot shaft • Apply silicone grease lightly.
—————
12 Rear brake lever 
pivot shaft • Apply lithium-soap-based grease 
lightly. —————
13
*
Centerstand and 
sidestand pivots • Check operation.
• Apply lithium-soap-based grease 
lightly. —————
14
*
Sidestand switch • Check operation and replace if 
necessary. ——————
15
*
Front fork • Check operation and for oil 
leakage.
• Replace if necessary. —————
16
*
Shock absorber 
assemblies • Check operation and for oil 
leakage.
• Replace if necessary. —————
17 Engine oil • Change (warm engine before 
draining).
• Check oil level and vehicle for oil  leakage. ——————
NO. ITEM ROUTINE
INITIAL ODOMETER READING
600 mi
(1,000 km)  or1
month 2,000 mi
(4,000 km)  or6
months 4,000 mi
(7,000 km)  or
12
months 6,000 mi
(10,000 km)  or
18
months 8,000 mi
(13,000 km)  or
24
months 10,000 mi
(16,000 km)  or
30
months 
						

							
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PERIODIC MAINTENANCE AND ADJUSTMENT
6-6
* Since these items require special tools, data and technical skills, have a Yamaha dealer perform the service.
TIP
From 12000 mi (19000 km) or 36 months, repeat the maintenance intervals starting from 4000 mi (7000 km) or 12 months.18
*
Engine oil strainer• Clean. ———
19 Final transmission 
oil • Check vehicle for oil leakage.
• Change.
———
20
*
V-belt • Replace. Every 1200 0 mi (18000 km)
21
*
Front and rear brake 
switches • Check operation.
——————
22
*
Control and meter 
cables • Apply Yamaha chain and cable 
lube or engine oil thoroughly. ——————
23
*
Throttle grip housing 
and cable • Check operation and free play.
• Adjust the throttle cable free play if 
necessary.
• Lubricate the throttle grip housing  and cable. —————
24
*
Lights, signals and 
switches • Check operation.
• Adjust headlight beam.
——————
NO. ITEM ROUTINE
INITIAL ODOMETER READING
600 mi
(1,000 km)  or1
month 2,000 mi
(4,000 km)  or6
months 4,000 mi
(7,000 km)  or
12
months 6,000 mi
(10,000 km)  or
18
months 8,000 mi
(13,000 km)  or
24
months 10,000 mi
(16,000 km)  or
30
months 
						

							
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EAUT2710
TIP8 Air filter and V-belt filter
9This model’s air filter is equipped with a disposable oil-coated paper element, which must not be cleaned with
compressed air to avoid damaging it.
9 The air filter element needs to be replaced and V-belt filter needs to be serviced more frequently when riding in
unusually wet or dusty areas.
8 Hydraulic brake service
9After disassembling the brake master cylinder and caliper, always change the fluid. Regularly check the brake fluid
level and fill the reservoir as required.
9 Every two years replace the internal components of the brake master cylinder and caliper, and change the brake
fluid.
Replace the brake hose every four years and if cracked or damaged. 
						

							
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6-8
Panel, removing and installing
EAU18771
Removing and installing
panelsThe panels shown need to be removed
to perform some of the maintenance
jobs described in this chapter. Refer to
this section each time a panel needs to
be removed and installed.
1
2
1. Panel A
2. Panel B
EAU19272
Panel ATo remo
ve the panel
Remove the screw, and then pull out-
ward on the areas shown.
1
2
1. Panel A
2. ScrewTo install the panel
Place the panel in the original position,
and then install the screw.
EAUT2532
Panel BTo remo
ve the panel
1. Remove panel A. (See page 6-8.)
2. Remove the screws and the quick fastener screws, and then take the
panel off.
12
3
3
1. Panel B
2. Screw
3. Quick fastener screwTo install the panel1. Place the panel in the original posi- tion, and then install the screws and
the quick fastener screws.
2. Install panel A. 
						

							
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENTSpark plug, checking
EAUT1835
Checking the spark plugThe spark plug is an important engine
component, which is easy to check.
Since heat and deposits will cause any
spark plug to slowly erode, the spark
plug should be removed and checked in
accordance with the periodic mainte-
nance and lubrication chart. In addition,
the condition of the spark plug can re-
veal the condition of the engine.
To remove the spark plug1. Place the vehicle on the centerstand.
2. Remove panel B. (See page 6-8.)
3. Remove the spark plug cap.
4. Remove the spark plug as shown, with the spark plug wrench included
in the owner’s tool kit.
1
1. Spark plug wrenchTo check the spark plug
1. Check that the porcelain insulator around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the vehicle is
ridden normally).TIP
If the spark plug shows a distinctly dif-
ferent color, the engine could be operat-
ing improperly. Do not attempt to diag-
nose such problems yourself. Instead,
have a Yamaha dealer check the vehicle.
2. Check the spark plug for electrode
erosion and excessive carbon or
other deposits, and replace it if nec-
essary.Specified spark plug:U22ESR-N (DENSO)To install the spark plug
1. Measure the spark plug gap with a wire thickness gauge and, if nec-
essary, adjust the gap to specifi-
cation.Spark plug gap:0.7 ~ 0.8 mm (0.028 ~ 0.031 in)2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
3. Install the spark plug with the spark plug wrench, and then tighten it to
the specified torque.Tightening torque:Spark plug:

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TIP
If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4 ~ 1/2 turn
past finger tight. However, the spark plug
should be tightened to the specified
torque as soon as possible.4. Install the spark plug cap.
5. Install the panel.
Engine oil
EAUT2592
Engine oilThe engine oil level should be checked
before each ride. In addition, the oil must
be changed and the oil strainer cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
To check the engine oil level
1. Place the vehicle on the centerstand. A slight tilt to the side
can result in a false reading.
2. Start the engine, warm it up for sev- eral minutes, and then turn it off.
1
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1. Oil filler cap
2. Maximum level mark
3. Minimum level mark
3. Wait a few minutes until the oilsettles, remove the oil filler cap,
wipe the dipstick clean, insert it
back into the oil filler hole (without
screwing it in), and then remove it
again to check the oil level.TIP
The engine oil should be between the
minimum and maximum level marks.4. If the engine oil is below the mini-mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Insert the dipstick into the oil filler hole, and then tighten the oil filler
cap.
To change the engine oil 1. Start the engine, warm it up for sev- eral minutes, and then turn it off.
2. Place an oil pan under the engine to collect the used oil.
3. Remove the engine oil filler cap and the engine oil drain bolt to drain the
oil from the crankcase. 
						

							
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1
1. Oil filler cap4. Install the engine oil drain bolt, andthen tighten it to the specified
torque.
1
1. Engine oil drain bolt
Tightening torque:Engine oil drain bolt:5. Refill with the specified amount of
the recommended engine oil, and
then install and tighten the oil filler
cap.Recommended engine oil:See page 8-1.
Oil change quantity:
0.85 L (0.90 US qt, 0.75 Imp.qt)
ECA11670
NOTICE●
● ●
●
●
Do not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. In
addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.
●
● ●
●
●
Be sure no foreign material en-
ters the crankcase.
6. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking, immediately turn the engine off and
check for the cause.
7. Turn the engine off, and then check the oil level and correct it if neces-
sary. 
						

							
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EAU20064
Final transmission oilThe final transmission case must be
checked for oil leakage before each ride.
If any leakage is found, have a Yamaha
dealer check and repair the scooter. In
addition, the final transmission oil must
be changed as follows at the intervals
specified in the periodic maintenance
and lubrication chart.1. Start the engine, warm up the final transmission oil by riding the
scooter for several minutes, and
then stop the engine.
2. Place the scooter on the centerstand.
3. Place an oil pan under the final transmission case to collect the
used oil.
1
1. Final transmission oil filler cap4. Remove the final transmission oilfiller cap and final transmission
drain bolt to drain the oil from the
final transmission case.
5. Install the final transmission oil drain bolt, and then tighten it to the
specified torque.
Final transmission oil
1
1. Final transmission oil drain boltTightening torque:
Final transmission oil drain bolt:6. Refill with the specified amount of
the recommended final transmis-
sion oil, and then install and tighten
the oil filler cap.  WARNING! Make
sure that no foreign material en-
ters the final transmission case.
Make sure that no oil gets on the
tire or wheel.
[EWA11311]
Recommended final transmission oil: See page 8-1.
Oil quantity: 0.13 L (0.14 US qt, 0.11 Imp.qt)
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EAU1722A
PERIODIC MAINTENANCE AND ADJUSTMENT7. Check the final transmission casefor oil leakage. If oil is leaking,
check for the cause.
EAUT2660
Air filter and V-belt case air
filter elementsThe air filter and V-belt case air filter el-
ements should be cleaned at the inter-
vals specified in the periodic mainte-
nance and lubrication chart. Check both
filter elements more frequently if you are
riding in unusually wet or dusty areas.
The air filter check hose must be fre-
quently checked and cleaned if neces-
sary.
Replacing the air filter element
1
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1. Air filter case cover
2. Screw
3. Air filter check hose
Air filter and V-belt case air filter elements
1. Place the scooter on thecenterstand.
2. Remove the air filter case cover by removing the screws.
3. Pull the air filter element out.
4. Insert a new air filter element into the air filter case. 
NOTICE:
 Make
sure that the air filter element is
properly seated in the air filter
case. The engine should never be
operated without the air filter el-
ement installed, otherwise the
piston(s) and/or cylinder(s) may
become excessively worn.[ECA10481]
5. Install the air filter case cover by installing the screws.
Cleaning the air filter check hose 1. Check the hose on the front side of the air filter case for accumulated
dirt or water.
2. If dirt or water is visible, remove the hose, clean it, and then install
it.
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