2018 YAMAHA NMAX 125 cooling

For your safety – pre-operation checks
4-1
4
EAU63440
Inspect your vehicle each time you use it to make sure the vehicle is in safe oper-
ating condition. Always follow the inspection and maintenance procedures and
schedules described in the Owner’s Manual.
WARNING
EWA11152
Failure to inspect or maintain the vehicle properly increases the possibility
of an acci dent or equipment d amage. Do not operate the vehicle if you fin d
any pro blem. If a pro blem cannot be correcte d b y the proce dures provi ded
in this manual, have the vehicle inspecte d b y a Yamaha dealer.
Before using this vehicle, check the following points:
ITEM CHECKSPAGE
Fuel • Check fuel level in fuel tank.
• Refuel if necessary.
• Check fuel line for leakage.
• Check fuel tank overflow hose for obstructions, cracks
or damage, and check hose connection. 3-13,
3-15
En gine oil • Check oil level in engine.
• If necessary, add recommended oil to specified level.
• Check vehicle for oil leakage. 6-10
Final transmission oil • Check vehicle for oil leakage. 6-12
Coolant • Check coolant level in reservoir.
• If necessary, add recommended coolant to specified
level.
• Check cooling system for leakage. 6-13
Front brake • Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage. 6-23,
6-24, 6-25
Rear brake • Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage. 6-23,
6-24, 6-25
Throttle grip • Make sure that operation is smooth.
• Check throttle grip free play.
• If necessary, have Yamaha dealer adjust throttle grip
free play and lubricate cable and grip housing. 6-19,
6-27
UBV3E0E0.book Page 1 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-15
6
4. Place a container under the en-
gine to collect the used coolant.
5. Remove the radiator cap. WARNING! Never attempt to re-
move the ra diator cap when the
en gine is hot.
[EWA10382]
6. Remove the coolant drain screw
and its O-ring to drain the cooling
system. 7. Remove the coolant drain bolt and
its gasket to drain the cooling sys-
tem.
8. Remove the coolant reservoir by removing the bolt.
1. Radiator cover
2. Bolt
1. Radiator cap
1
2
1
1. Coolant drain screw
2. O-ring
1. Coolant drain bolt
2. Gasket
1. Coolant reservoir cap
2. Coolant reservoir
3. Bolt
1
2
1
2
1
2
3
UBV3E0E0.book Page 15 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-16
6 9. Remove the coolant reservoir cap,
and then turn the coolant reservoir
upside down to empty it.
10. After the coolant is completely drained, thoroughly flush the cool-
ing system with clean tap water.
11. Install the coolant reservoir by in- stalling the bolt.
12. Install the coolant drain bolt and its new gasket, and then tighten
the bolt to the specified torque.
13. Install the coolant drain screw and its new O-ring.
14. Pour the recommended coolant into the reservoir to the maximum
level mark, and then install the
coolant reservoir cap.
15. Pour the recommended coolant into the radiator until it is full.
16. Install the radiator cap, start the engine, let it idle for several min-
utes, and then turn it off.
17. Remove the radiator cap to check the coolant level in the radiator. If
necessary, add sufficient coolant until it reaches the top of the radi-
ator, and then install the radiator
cap.
18. Start the engine, and then check the vehicle for coolant leakage. If
coolant is leaking, have a Yamaha
dealer check the cooling system.
19. Install the radiator cover by install- ing the bolts.
20. Install the panels.
Ti ghtenin g torque:
Coolant drain bolt: 10 N·m (1.0 kgf·m, 7.2 lb·ft)
Antifreeze/water mixture ratio: 1:1
Recommen ded antifreeze:
High-quality ethylene glycol anti-
freeze containing corrosion inhibi-
tors for aluminum engines
Coolant quantity: Radiator (including all routes):0.46 L (0.49 US qt, 0.40 Imp.qt)
Coolant reservoir (up to the maxi-
mum level mark): 0.25 L (0.26 US qt, 0.22 Imp.qt)
UBV3E0E0.book Page 16 Monday, September 26, 2016 3:42 PM

Periodic maintenance an d a djustment
6-41
6
En
gine overheatin g
WARNING
EWAT1041
Do not remove the rad iator cap when the engine an d ra diator are hot.
Scal din g hot flui d an d steam may b e blown out un der pressure, which
coul d cause serious injury. Be sure to wait until the en gine has coole d.
 Place a thick ra g, like a towel, over the rad iator cap, and then slowly ro-
tate the cap counterclockwise to the d etent to allow any residual pres-
sure to escape. When the hissin g soun d has stoppe d, press d own on the
cap while turnin g it counterclockwise, an d then remove the cap.
TIP
If coolant is not available, tap water can be temporarily used instead, provided
that it is changed to the recommended coolant as soon as possible.
Wait until the engine
has cooled.
Check the coolant
level in the reservoir
and radiator.Add coolant.
(See TIP.)
The coolant level is
OK.
There is no leakage.
There is leakage.
The coolant level is
low.
Check the cooling
system for leakage.
Have a Yamaha
dealer check and
repair the cooling
system.
Start the engine. If the engine overheats again,
have a Yamaha dealer check and repair the cooling
system.
UBV3E0E0.book Page 41 Monday, September 26, 2016 3:42 PM

Specifications
8-1
8
Dimensions:
Overall length:1955 mm (77.0 in)
Overall width:
740 mm (29.1 in)
Overall height: 1115 mm (43.9 in)
Seat height: 765 mm (30.1 in)
Wheelbase:
1350 mm (53.1 in)
Ground clearance: 135 mm (5.31 in)
Minimum turning radius: 2.0 m (6.56 ft)
Wei ght:
Curb weight:
127 kg (280 lb)
Engine:
Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train: SOHC
Number of cylinders: Single cylinder
Displacement:
125 cm³ (GPD125-A)
155 cm³ (GPD150-A)
Bore × stroke:
52.0 × 5 8 . 7 m m (2 . 0 5 × 2.31 in) (GPD125-A)
58.0 × 5 8 . 7 m m (2 . 2 8 × 2.31 in) (GPD150-A)
Compression ratio:
10.5 : 1 (GPD150-A)
11.2 : 1 (GPD125-A)
Starting system:
Electric starter
Lubrication system: Wet sump
Engine oil:
Recommended brand:
YAMALUBE
SAE viscosity grades: 10W-40
Recommended engine oil grade: API service SG type or higher, JASO
standard MA or MB Engine oil quantity:
Oil change:
0.90 L (0.95 US qt, 0.79 Imp.qt)
Final transmission oil:
Type: Motor oil SAE 10W-30 type SE or higher or
Gear oil SAE 85W GL-3
Quantity: 0.15 L (0.16 US qt, 0.13 Imp.qt)
Coolant quantity:
Coolant reservoir (up to the maximum level
mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator (including all routes):
0.46 L (0.49 US qt, 0.40 Imp.qt)
Air filter:
Air filter element:Oil-coated paper element
Fuel:
Recommended fuel:Regular unleaded gasoline (Gasohol [E10]
acceptable)
Fuel tank capacity: 6.6 L (1.7 US gal, 1.5 Imp.gal)
Fuel reserve amount: 1.4 L (0.37 US gal, 0.31 Imp.gal)
Fuel injection:
Throttle body:ID mark:
2DS1 00
Spark plu g(s):
Manufacturer/model:
NGK/CPR8EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Clutch:
Clutch type:Dry, centrifugal, shoe
Drivetrain:
Primary reduction ratio:1.000
Final drive: Gear
Secondary reduction ratio:
10.208 (56/16 x 35/12)
Transmission type: V-belt automatic
Chassis:
Frame type:
Underbone
UBV3E0E0.book Page 1 Monday, September 26, 2016 3:42 PM