Item

XJ750K

Dimensions:

Overall Length

2,145 mm (84.4 in)

Overall width

830 mm {32.7 in)

Overall Height

1,175 mm (46.3 in)

Seat Height

780 mm (30.7 in)

Wheelbase

1,445 mm (56.9 in)

Minimum Ground Clearance

135 mm ( 5.3 in)

Basic Weight:

With Oil and Full Fuel Tank

234 kg (515 lb)

Minimum Turning Radius:

2,600 mm (102.4 in)

Engine:

Engine Type

Air cooled 4-stroke, gasoline, DOHC

Cylinder Arrangement

4-cylinder parallel

Displacement

748 cm³ (45.64 cu.in)

Bore x Stroke

65.0 x 56.4 mm (2.559 x 2.220 in)

Compression Ratio

9.2:1

Compression Pressure

1,078 kPa (11kg/cm², 156 psi) at 300 r/min

Starting System

Electric starter

Lubrication System:

Pressure lubricated, wet sump

Oil Type or Grade:

Engine oil

Yamalube 4-cycle oil or SAE 20W40 type SE

motor oil

(If temperature does not go below 5 C (40°F).)

SAE 10W30 type SE motor oil

(If temperature does not go above 15°C (60°F).)

Final Gear Oil

SAE 80 API "GL-4" Hypoid gear oil

Oil Capacity:

Engine Oil:

Periodic Oil Change

2.5 L (3.17 Imp qt, 3.81 US qt)

With Oil Filter Replacement

2.8 L (2.46 Imp qt. 2,64 US qt)

Total Amount

3.5 L (3.17 Imp qt. 3.81 USqt)

Final Gear Case Oil Amount

0.2 L (0.18 Imp qt, 0.21 US qt)

Air Filter

Dry type element

Fuel:

Type

Regular gasoline

Tank Capacity

17 L (3.74 Imp gal, 4.49 US gal)

Reserve Amount

3.5 L (0.8 Imp gal, 0.9 US gal)

Carburetor:

Type

HSC32

Manufacturer

HITACHI

Dimensions

Standard size

Wear limit

Intake

A

36.80 mm (1.449 in)

36.65 mm (1.443 in)

B

28.00 mm (1.102 in)

27.85 mm (1.096 in)

C

8.80 mm (0.346 in)

-

Exhaust

A

35.80 mm (1.449 in)

35.65 mm (1.404 in)

B

28.00 mm (1.102 in)

27.85 mm (1.096 in)

C

7.80 mm (0.307 in)

-

Inner Intake/Exhaust

Outer Intake/Exhaust

Free length

35.9 mm (1.413 in)

39.5 mm (1.555 in)

Spring rate

2.36 kg/mm (132.2 lb/in)

4.58 kg/mm (256.5 Ib/in)

Installed length (valve closed)

31.0 mm (t.220 in)

34.0 mm (1.339 in)

Installed pressure (valve closed)

9.0 kg (19.81b)

19.1 kg (42.1 lb)

Compressed length (valve open)

IN: 22.5 mm (0.886 in) EX: 23.5 mm (0.925 in)

IN: 25.5 mm (1.004 in) EX: 26.5 mm (1.043 in)

Wire diameter

2.8 mm (0.110 in)

3.9 mm (0.154 in)

Number of windings

7.75

6.0

Winding O.D.

20.6 (^+0.3 _-0) mm
(0.811in ^+0.012 _-0 ) in

29.4 (⁺⁰ _-0.3) mm
1.157  ⁽⁺⁰ _-0.012 ) in

Clearance (Cold engine)

0.11 ~0.15mm
(0.004 ~ 0.006 in)

"A" head diameter

33 ±0.1 mm 
(1.2992 ±0.0039 in)

"B" face width

2.3 mm 
(0.0906 in)

"C" seat width

1.0 ±0.1 mm 
(0.0394 ± 0.0039 in)

"D" margin thickness (minimum)

1.2 ±0.2 mm 
(0.0472 ± 0.0079 in)

Stem diameter (O.D.)

7^-0.010 _-0.025 mm

(0.2756 ^-0.0004 __0.0010 in)

Guide diameter (I.D.)

7^+0.012 _-0 mm

(0.2756 ^+0.0005 _-0 in)

Stem-to-guide clearance

0.010 ~ 0.037 mm 
(0.0004 ~ 0.0015 in)

Clearance (Cold engine)

0.16~0.20mm (0.006 ~0.008 in)

"A" head diameter

28 ±0.1 mm (1.2205 ±0.0039 in)

"B" face width

2.3 mm (0.0906 in)

"C" seat width

1.0 ±0.1 mm (0.0394 ± 0.0039 in)

7 ^-0.025 _-0.040 mm

(0.2756 ^-0.0010 __0.0016 in)

7^+0.012 _-0 mm

(0.2756 ^+0.0005 _-0 in)

Cylinder and piston:

Cylinder material

Aluminum alloy

Cylinder liner

Pressed in; special cast iron

Bore size: Standard

65.00 mm (2.5591 in)

Wear limit

65.10 mm (2.5630 in)

Cylinder taper limit

0.05 mm (0.0020 in)

Cylinder out-of-round limit

0.01 mm (0.0004 in)

Piston clearance: Standard

0.030 ~ 0.050 mm 
(0.0012 ~ 0.0020 in)

Maximum

0.1 mm (0.0039 in)

Piston ring:

Top

2nd

Oil

Design

Barrel

Taper

Expander

End gap (installed):

Standard

0.15 ~ 0.35 mm (0.0059 ~ 0.0318 in)

0.15 ~ 0.35 mm (0.0059 ~ 0.0138 in)

0.3 ~ 0.9 mm (0.0018 ~ 0.035 in)

Limit

1.0 mm (0.0394 in)

1.0 mm (0.0394 in)

1.5 mm (0.0591 in)

Side clearance:

Standard

0.03 ~ 0.07 in (0.0012 ~ 0.0028 in)

0.02 ~ 0.06 in (0.008 ~ 0.0024 in)

-

Limit

0.15 mm (0.0059 in)

0.15 mm (0.0059 in)

-

Crankshaft:

Crank journal/bearing oil clearance

0.004 ~ 0.064 mm (0.0016 ~ 0.0025 in)

Main journal run-out (maximum)

0.040 mm (0.0016 in)

Connecting rods:

Rod bearing oil clearance

0.03 ~ 0.09 mm (0.0012 ~ 0.0035 in)

Oil pump:

Housing-to-outer rotor clearance

0.09 - 0.15 mm (0.0035 ~ 0.0059 in)

Outer rotor-to-inner rotor clearance

0.03 ~ 0.09 mm (0.0012 - 0.0035 in)

Clutch:

Friction plate:

Thickness/q'ty

3.0mm(0.12in)/8

Minimum thickness

2.8 mm (0.11 in)

Clutch plate:

Thickness

1.6 mm (0.063 in)/7

Warp limit

0.05 mm (0.0020 in)

Clutch spring:

Length/q'ty

41.2 mm (1.622 in)/5

Minimum length

40.2 mm (1.583 in)

Spring rate

1.22 kg/mm (68.3 lb/in)

Clutch lever free play (at lever pivot point)

2~ 3 mm (0.08 ~ 0.12 in)

Transmission shaft run-out maximum:

0.08 mm (0.0031 in)

Middle gear case lash:

0.1 ~ 0.2 mm (0.0039 - 0.0079 in)

Manufacturer

HITACHI

Model I.D. No.

5G200

Main jet

#120

Pilot jet

#40

Starter jet

#40 (00.9)

Jet needle

Y-13

Fuel level

3±1 mm (0.118±0.039 in)

Pilot screw

Preset

Air jet. Main

#80

Air jet. Pilot

#225

Float valve seat

02.0

Engine idle speed

1,050 r/min

Wheels and tires:
Rim run-out: Vertical
Horizontal

2.0 mm (0.079 in) 
2.0 mm (0.079 in)

Tire pressure (cold)

Front

Rear

Up to 90 kg (198(b) load*

1.8 kg/cm² (26 psi)

2.0 kg/cm² (28 psi)

90 kg (198 lb) ~ 215 kg (474 lb) load* 
(Maximum load)

2.0 kg/cm² (28 psi)

2.3 kg/cm² (32 psi)

High speed riding

2.3 kg/cm² (32 psi)

2.5 kg/cm² (36 psi)

Minimum tire tread depth

0.8 mm (0.03 in)

0.8 mm (0.03 in)

Brakes:

Recommended fluid

DOT #3

Pad wear limit

0.8 mm (0.03 in)

Rear brake lining wear limit

2 mm (0.08 in)

Brake disc maximum deflection

0.15 mm (0.006 in)

Brake disc minimum thickness

4.5 mm (0.18 in)

Front brake free play 

5 ~ 8 mm (0.2 ~ 0.3 in)

Rear brake free play 
(end of pedal)

20 ~ 30 mm (0.8 ~1.2 in)

Front forks:

Travel

150 mm (5.9 in)

Spring free length

458.5 mm (18.05 in)

Spring rate:

0~97mm(0~3.84in)

0.76 kg/mm (43.4 lb/in)

97 ~ 150 mm (3.87 ~ 5.91 in)

0.98 kg/mm (55.9 lb/in)

Fork oil capacity (each side)

257 cc (9.0 imp. oz)

Oil type

SAE 10W30 type SE motor oil

Rear shock absorbers:

Spring free length

227.8 mm (8.97 in)

Spring preload length

207.8 mm (8.18 in)

Spring rate:

0~55mm (0~ 2.17 in)

1.7 kg/mm (97.0 lb/in)

55 ~ 80 mm (2.17~3.15 in)

2.1 kg/mm (119.9 lb/in)

Travel

80 mm (3.15 in)

Item

XJ750K

Voltage:

12V

Ignition System:

Ignition Timing (B.T.D.C.l

Advanced Timing (B.T.D.C.) Advancer Type

7° at 1,050 r/min

30° at 4,000 r/min Electrical

-

T.C.I.:

Pick-up Coil Resistance (Color)

T.C.I. Unit— Manufacturer

650Ω ± 20% at 20°C (68° F) (Black - Gray)(Black - Orange)

TID14-06/HITACHI

Ignition Coil:

Model/Manufacturer
Minimum Spark Gap
Primary Winding Resistance
Secondary Winding Resistance

CM12-09/HJTACHI

6mm (0.24 in) or more at 500 r/min
2.5Ω± 15% at 20°C(68°F)
11kΩ± 15% at 20^oC(68°F)

Charging System: Type

A.C. Generator

A.C. Generator:

Model/Manufacturer
Nominal Output

LD119-08/HITACHI
14V, 19A at 5,000 r/min

Field Coil Resistance
Armature Coil Resistance

4.0Ω± 10% at20°C(68°F)
0.46Ω ± 10% at 20°C (68°F) (White - White)

Item

XJ750K

Voltage Regulator: Type
Model/Manufacturer
No Load Regulated Voltage

Semi Conductor, Field control
S8534/TOSHIBA
14.5 ± 0.5V

Rectifier:
Model/Manufacturer
Capacity

S8534/TOSHIBA
15A

Battery: Capacity
Specific Gravity

12V 14 AH
1.280

Electric Starter System:
Type
Starter Motor:
Model/ManufacturerOutput
Armature Coil Resistance
Brush:
Overall Length
< Limit >
Spring Pressurer
Commutator Dia.
Wear Limit
Mic Undercut
Starter Switch:
Amperage Rating

Constant-mesh type

ADB4D2/NIPPONDENSO0.6 kW
0.01412 ±6% at 20% (68"F)

12 mm (0.472 in)

8.5 mm (0.335 in)
800 ± 150 g (28.22 ± 5.29 oz)
28 mm (1.10 in)
27 mm (1.06 in)
0.6 mm (0.024 in)

150A

Horn:

Type/Quantity
Model/Manufacturer
Maximum Amperage

Eddy type x 2
YPL, YPH/NIKKO
2.0A

Flasher Relay:
Type
Model/Manufacturer
Self Cancelling Device
Flasher Frequency
Wattage

Condenser type
FU257CD/NIPPONDENSO
Yes
85 ± 10cycle/min
27W x 2 pcs + 3.4W

Self Cancelling Unit:
Model/Manufacturer

YH-001/MATSUSHITA

Oil level Switch:
Model/Manufacturer

10L/NIPPONDENSO

Circuit Breaker:
Type
Amperage for individual Circuit/Quantity:
MAIN
HEADLIGHT
SIGNAL
IGNITION

Fuse

20Ax 1
10Ax 1
10Ax1
10Ax 1

Side Stand Relay: Model/Manufacturer Coil Winding Resistance Color Code

G2MW-D-3626/TATEISHI 1000 t 10% at2tfC(6£fF) Blue

Starting-Circuit Cut-off Relay:
Model/Manufacturer
Coil Winding Resistance
Color Code

G2MW-D-3601/TATEISHI
100Ω i 10% at 20^oC(68°F)
No.

Part to be tightened

Part name

Thread size

Q'ty

Tightening torque

Remarks

m-kg

ft-lb

ENGINE:

Cylinder head

Nut

M10 P1.25

12

3.2

23.1

Apply oil.

Cylinder head cover

Bolt

M6 P1.0

20

1.0

7.2

Spark plug

-

4

2.0

14.5

Cylinder

Nut

M8 P1.25

2

2.0

14.5

Cam chain case 
Front & Rear

Cam shaft cap

Bolt

M6 P1.0

20

1.0

7.2

Tighten in 3 stages.

Cam sprocket

Bolt

M7 P1.0

4

2.0

14.5

Cam chain tensioner 
adjustment lock nut

Nut

M8 P1.25

1

0.9

6.5

Cam chain tensioner 
end plug

Bolt

M8 P1.25

1

1.5

10.8

Connecting rod

Nut

M7 P0.75

8

2.5

18.1

Generator (rotor)

Bolt

M10 P1.25

1

5.5

39.8

Drain plug

Bolt

M14 P1.5 
M8 P1.25

1 
1

4.3 
1.6

31.0 
11.6

Crankcase drain 
Middle gear case drain

Oil filter

Bolt

M20 P1.5

1

1.5

11.0

Pump cover

Screw

M6 P1.0

0.7

5.1

Strainer cover

Bolt

M6 P1.0

13

0.7

5.1

Crankcase

Flange
bolt

M8 P1.25 
M6 P1.0

12 
27

2.4 
1.2

17.5 
8.7

Clutch boss

Nut

M20 P1.0

1

7.0

50.6

Clutch spring screw

Bolt

M6 P1.0

5

1.0

7.2

Change pedal

Bolt

M6 P1.0

1

0.8

5.8

Neutral switch

-

M10 P1.25

1

2.0

14.5

Exhaust pipe

Nut

M6 P1.0

8

0.75

5.4

Part to be tightened

Part name

Thread size

Q'ty

Tightening 
torque

Remarks

m-kg

ft-lb

SHAFT DRIVE:

Middle gear:

Drive shaft

Nut

M34 P1.5

1

11

80.0

Stake.

Mount cover

Screw

M8 P1.25

4

2.5

18.1

Stake.

Driven shaft

Nut

M14 P1.5

1

12

87.0

Use LOCTITE
Stake.

Bearing cap

Flange bolt

M8 P1.25

4

2.5

18.1

Final gear:

Drive shaft

Nut

M14 P1.5

1

11

80.0

Bearing housing

Flange bolt

M10 P1.25

2

2.3

16.6

Bearing housing

Nut

M8 P1.25

6

2.3

16.6

Oil mount screw

Plug

M14 P1.5

1

2.3

16.6

Oil drain screw

Plug

M14 P1.5

1

2.3

16.6

Bearing retainer

-

M65 P1.5

1

11

80.0

Left hand screw

CHASSIS:

Engine mounting bolt:

Front, upper

Nut

M10 P1.25

1

4.2

30.4

Front, under

Nut

M10 P1.25

2

4.2

30.4

Rear

Nut

M10 P1.25

2

7.0

50.6

Engine mounting stay:

Front

Nut

M8 P1.25

4

2.0

14.5

Handle crown & Steering shaft

Bolt 
Nut

M14 P1.25 
M8 P1.25

1 
1

5.4 
2.0

39.1 
14.5

Handle crown & Inner tube

Nut

M8 P1.25

1

2.0

14.5

Handle crown & Handle holder

Bolt

M8 P1.25

2

2.0

14.5

Front fork:

Under bracket & Inner tube

Bolt

M8 P1.25

4

2.0

14.5

Front wheel shaft

Nut castle

M14 P1.5

1

10.7

77.4

Front wheel axle pinch bolt

Nut salf locking

M8 P1.25

2

2.0

14.5

Pivot shaft

Bolt

M22 P1.5

1

0.55

4.0

Taper roller 
bearing

Rear wheel shaft

Nut castle

M14 P1.5

1

10.7

77.4

Rear shock absorber (Upper)

Nut cap

M10 P1.25

2

3.0

21.7

Rear shock absorber (Lower)

L Nut cap R Bolt

M10 P1.25

2

3.0

21.7

Footrest

Bolt

M10 P1.25

2

4.2

30.4

Tension bar & Brake plate

Bolt

M8 P1.25

1

2.0

14.5

Tension bar & Rear arm

Bolt

M8 P1.25

1

2.0

14.5

Camshaft lever & Camshaft

Bolt

M6 P1.0

1

0.9

6.5

Disc brake section:

Brake disc & Hub (Front)

Bolt

M8 P1.25

12

2.0

14.5

Lock washer

Master cylinder & 
Brake hose (Front)

Bolt union

M10 P1.25

1

2.0

14.5

Brake hose & Joint

Bolt union

M10 P1.25

1

2.6

18.8

Caliper & Brake hose

Bolt union

M10 P1.25

1

2.6

18.8

Caliper & Front fork (Front)

M10 P1.25

1

4.5

32.5

Caliper bleed screw (Front)

M8 PI.25

1

0.6

4.3

DEFINITION OF TERMS:

m-kg

= Meter-kilogram(s) (usually torque)

9

= Gram(s)

kg

= Kilogram(s) (1,000 grams)

lit

= Liter(s)

km/lit

= Kilometer(s) per liter (fuel consumption)

cc

= Cubic centimeter(s) (cm³) (volume or capacity)

kg/mm

= Kilogram(s) per milimeter (usually spring compression rate)

kg/cm²

= Kilogram(s) per square centimeter (pressure)

L........

O........

Br........

B........

Dg.......

Y........

Sb.......

Ch.......

G........

R........

P........

Gy.......

W........

R/W......

R/Y......

Blue

Orange

Brown

Black

Dark green

Yellow

Sky blue

Chocolate

Green

Red

Pink

Gray

White

Red/White

Red/Yellow

W/G......

Br/W......

L/B.......

W/Y......

G/Y......

W/R......

G/L......

L/W......

W/B......

Y/R......

Y/G......

L/Y......

B/Y......

B/R......

G/R......

B/W......

White/Green

Brown/White

Blue/Black

White/Yellow

Green/Yellow

White/Red

Green/Blue

Blue/White

White/Black

Yellow/Red

Yellow/Green

Blue/Yellow

Black/Yellow

Black/ Red

Green/Red

Black/White