Specifications

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.