
Periodic maintenance and adjustment
6-38
1
2
3
4
56
7
8
9
10
11
12 Engine overheating
WARNING
EWA10401
Do not remove the radiator cap when the engine and radiator are hot. Scalding hot fluid and steam may be
blown out under pressure, which could cause serious injury. Be sure to wait until the engine has cooled.
After removing the radiator cap retaining bolt, place a thick rag, like a towel, over the radiator cap, and then
slowly rotate the cap counterclockwise to the detent to allow any residual pressure to escape. When the hissingsound has stopped, press down on the cap while turning it counterclockwise, and then remove the cap.
TIPIf coolant is not available, tap water can be temporarily us
ed instead, provided that it is changed to the recommended coolantas soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again,
have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
UB90E2.book 38 ページ 2018年6月5日 火曜日 午後5時40分

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Specifications
EAU6999C
Dimensions:Overall length: 2075 mm (81.7 in)
Overall width: 815 mm (32.1 in)
Overall height: 1140 mm (44.9 in)
Seat height:
830 mm (32.7 in)
Wheelbase: 1440 mm (56.7 in)
Ground clearance: 135 mm (5.31 in)
Minimum turning radius:
3.0 m (9.84 ft)Weight:Curb weight:195 kg (430 lb)Engine:Combustion cycle:4-stroke
Cooling system: Liquid cooled
Valve train:
DOHC
Cylinder arrangement: Inline
Number of cylinders: 3-cylinder
Displacement:
847 cm
3
Bore stroke:
78.0 59.1 mm (3.07 2.33 in) Compression ratio:
11.5 : 1
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 stan-
dard MA
Engine oil quantity: Oil change:2.40 L (2.54 US qt, 2.11 Imp.qt)
With oil filter removal: 2.70 L (2.85 US qt, 2.38 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): 1.93 L (2.04 US qt, 1.70 Imp.qt)Air filter:Air filter element:
Oil-coated paper elementFuel:Recommended fuel:Premium unleaded gasoline (Gasohol
[E10] acceptable)
Fuel tank capacity: 14 L (3.7 US gal, 3.1 Imp.gal) Fuel reserve amount:
2.6 L (0.69 US gal, 0.57 Imp.gal)
Fuel injection:Throttle body:ID mark:
B901 00Spark plug(s):Manufacturer/model: NGK/CPR9EA9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)Clutch:Clutch type:Wet, multiple-discDrivetrain:Primary reduction ratio:1.681 (79/47)
Final drive: Chain
Secondary reduction ratio:
2.813 (45/16)
Transmission type: Constant mesh 6-speed
Gear ratio: 1st:2.667 (40/15)
2nd: 2.000 (38/19)
3rd:
1.619 (34/21)
4th: 1.381 (29/21)
5th: 1.190 (25/21)
UB90E2.book 1 ページ 2018年6月5日 火曜日 午後5時40分

Specifications
8-3
1
2
3
4
5
6
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Rear turn signal light: 10.0 W
Auxiliary light:
5.0 W
License plate light: 5.0 W
Meter lighting: LED
Neutral indicator light:
LED
High beam indicator light: LED
Oil level warning light: LED
Turn signal indicator light:
LED
Coolant temperature warning light: LED
Engine trouble warning light: LED
ABS warning light:
LED
Immobilizer system indicator light: LED
Traction control system indicator light: LEDFuse(s):Main fuse:50.0 A
Auxiliary fuse 1: 2.0 A
Headlight fuse:
15.0 A Signaling system fuse:
7.5 A
Ignition fuse:
15.0 A
Parking lighting fuse: 7.5 A
Radiator fan motor fuse: 15.0 A
Fuel injection system fuse:
10.0 A
ABS control unit fuse: 7.5 A
ABS motor fuse: 30.0 A
ABS solenoid fuse:
15.0 A
Backup fuse: 7.5 A
Electronic throttle valve fuse: 7.5 A
UB90E2.book 3 ページ 2018年6月5日 火曜日 午後5時40分

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IndexAABS ....................................................... 3-17
ABS warning light.................................... 3-5
Air filter element .................................... 6-14
Auxiliary DC connector ......................... 3-30
Auxiliary light bulb, replacing ................ 6-34BBattery................................................... 6-28
Brake and clutch levers, checking and lubricating ........................................... 6-26
Brake and shift pedals, checking and lubricating ........................................... 6-25
Brake fluid, changing ............................ 6-22
Brake fluid level, checking .................... 6-20
Brake lever ............................................ 3-16
Brake lever free play, checking ............. 6-19
Brake light switches .............................. 6-19
Brake pedal ........................................... 3-17
Brake/tail light ....................................... 6-34CCables, checking and lubricating .......... 6-24
Canister................................................. 6-10
Care ........................................................ 7-1
Catalytic converter ................................ 3-22
Clutch lever ........................................... 3-15
Clutch lever free play, adjusting ............ 6-18
Coolant.................................................. 6-13
Coolant temperature warning light .......... 3-4DData recording, vehicle ........................... 9-2
Diagnostic connector .............................. 9-2
Dimmer switch ...................................... 3-14
D-mode (drive mode) ............................ 3-13
Drive chain, cleaning and lubricating .... 6-24 Drive chain slack .................................. 6-22
EEngine break-in ...................................... 5-3
Engine idling speed, checking .............. 6-14
Engine oil .............................................. 6-10
Engine serial number.............................. 9-1
Engine trouble warning light ................... 3-5FFront and rear brake
pads, checking .... 6-20
Front fork, adjusting .............................. 3-24
Front fork, checking .............................. 6-27
Fuel....................................................... 3-20
Fuel consumption, tips for reducing........ 5-3
Fuel tank cap ........................................ 3-19
Fuel tank overflow hose and breather hose ................................................... 3-22
Fuses, replacing ................................... 6-30HHandlebar switches .............................. 3-14
Hazard switch ....................................... 3-15
Headlight bulb, replacing ...................... 6-32
High beam indicator light ........................ 3-4
Horn switch ........................................... 3-14IIdentification numbers ............................ 9-1
Ignition circuit cut-off system ................ 3-28
Immobilizer system ................................. 3-1
Immobilizer system indicator light........... 3-5
Indicator lights and warning lights .......... 3-4LLicense plate light ................................. 6-35
Luggage strap holders .......................... 3-27MMain switch/steering lock........................ 3-2 Maintenance and lubrication, periodic..... 6-5
Maintenance, emission control system ... 6-3
Matte color, caution ................................. 7-1
Model label .............................................. 9-2
Multi-function meter unit .......................... 3-6
NNeutral indicator light .............................. 3-4OOil level warning light .............................. 3-4PParking .................................................... 5-4
Part locations .......................................... 2-1
Pass switch ........................................... 3-14SSafety information ................................... 1-1
Seat ....................................................... 3-23
Shifting .................................................... 5-2
Shift pedal ............................................. 3-16
Shock absorber assembly, adjusting .... 3-25
Sidestand .............................................. 3-27
Sidestand, checking an
d lubricating...... 6-26
Spark plugs, checking ............................. 6-9
Specifications .......................................... 8-1
Starting the engine .................................. 5-1
Steering, checking................................. 6-28
Stop/Run/Start switch............................ 3-15
Storage.................................................... 7-3
Storage compartment............................ 3-23
Supporting the motorcycle .................... 6-36
Swingarm pivots, lubricating ................. 6-27TThrottle grip and cable, checking and lubricating ........................................... 6-25
Throttle grip free play, checking ............ 6-15
UB90E2.book 1 ページ 2018年6月5日 火曜日 午後5時40分