Yamaha XS750 User manual

SPEC I F I CAT IONS
A. GENERAL SPECIFICATIONS
Basic color
Dimensions:
Overall length
Overa
l I width
Overall height
Seat height
Wheelbase
Minimum ground clearance
Caster (steering head angle)
TraiI
Weight:
Net
Engine:
Type
Bore x stroke x cylinders
Displacement
Compressionratio
Compression pressure (warm engine)
Lubr i cation :
Lubrication system
Delivery pump type
Carburetion:
Manufacture
Type, I.D. No., Quantity
Rated venturi size
Air filter
Ignition:
Type
Spark plug
Charging
Type
Manufacture, I.D. No.
Maximum output
Battery type
Battery dimensions
Regulator
Rectifier
Starting
Primary drive
Type
Teeth, ratio
Clutch
Crystal Silver
2180mm (85.8 in.)
835mm (32.9 in.)
1150mm (45.3 in.)
810mm (31.9 in.)
1465mm (57.7 in.)
145mm (5.7 in.)
27°
110mm (4.3 in.)
229 kg (505 Ibs.)
________~~
D.O.H.C.,air-cooled,triple
68mm x 68.6mm x3
747cc
8.5:1
142 Ibs in!(±14 Ibs in!)
Pressure lubricated, wet sump
Trocoid
Mikuni
BS34, constant velocity, 1J701, 3 pcs.
34mm
Dry foam rubber
Battery/coi
I
NGK BP-7ES, ChampionN - 7Y
Three - phase, regulated alternator
Hitachi LD120-02
14.5 Vo lt/l8 amp
12 volt 14 amp - hour
134 x 166 x 89mm
Hitachi TL1Z-80
Stanley DE - 4404, Silicon, full wave
Transmission coupled kick
Mitsuba Electric SM - 224C
Hy-Vo silent chain
45/27 1.666
Wet, multiple disc.

Transmission:
Teeth, ratio, overall 1st
2nd
3rd
4th
5th
Secondary Drive:
Transmission 0 utput :
Type, teeth, ratio
Middle gear case
Type, teeth, ratio
Final gear case
Type, teeth, ratio
Chassis:
Frame
Suspension:
Front (type, travel)
Rear (type, travel)
Front
Rear
Brakes:
Front
Rear
Fuel tank
Wheels:
Front
Rear
Tires:
Constant mesh,5 - speed, drum shifter
32/13 2.461 13.285
27/17 1.588 8.636
26/20 1.300 7.069
1 1.095 5.955
22/23 0.956 5.201
Shaft drive
Spur gear, 34/32, 1.063
Bevel gear, 19/18, 1.056
Bevel gear, 32/11, 2.909
Tubular steel double cradle
Telescopic fork, 175mm (6.9 in.)
Swing arm, 75mm (3.0 in.)
3.25 H19 Bridgestone
4.00 H 18 Bridgestone
Dual hydraulicdisc
Single hydraulicdisc
US gal.) Regular leaded or unleaded
1.85 x 19 Cast Aluminum
2.15 x 18 Cast Aluminum
B. MAINTENANCE SPECIFICATIONS
1. Engine
Engine Oil Capacity
Oil and filter change
Oil change
R ecommended Iubrican t :
If temperature does not go below
If temperature does not go above
(3.7
(3.4 US qt.)
(3.0 US qt.)
SAE
SE motor oil
SAE SE motor oil

Middle gear case capacity:
Final Gear case capacity
Recommended Iubr i can t
If temperature doesnot go below
5°C (40°F)
If temperature doesnot go above
A II weather
15°C (60°F)
A
Exhaust B
C
375cc ( 13 oz.)
300cc (1 00 oz.)
SAE 90 Hypoid gear oil, G L - 4
SAE 80 Hypoid gear oil, GL - 4
SAE80W90 Hypoid gear oil,GL - 4
8.018mmm -------------
28.285 ±0.05mm 28.13mm
36.303 ± 0.05mm 36.15mm
Cranking pressure (at sea level)
Maximum difference between cylinders
Free length
10 ± 1 kg/cm!(142 ± 14 psi)
1 .0 kg/cm!(14 psi)
INTAKE/EXHAUST
35.6mm
Camshafts
I
Wire diameter
Number of windings
2.8mm
7.75
Valve stem run - out maximum
Valve seat width standard/maximum
.03mm (.0012 in.)
1.3mm (.050 in.) / 2.0mm (.080 in.)
Wear Iim it
Camshaft bearing surface diameter 24.97~24.98mm (0.9830~0.9835 in.)
Camshaft - to - cap clearance :
Standard
Maximum
Camshaft runout limit
.020~.054mm (.0008~.002 in.)
.160mm (.006in.)
0.1 mm (.004 in) I
Valves
I INNER OUTER
INTAKE/EXHAUST
39.9mm
ALLOWABLE T I LT
FROM VERTICAL
OUTER
I
OUTER
Spring rate (kg/mm) K1 1.84
K2 2.36
K1 3.32
K2 4.18
Installed length
(valve closed)
Installed pressure
(valve closed)
34.5mm31.5mm
1 7.5 ± 0.75kg 17.5 ± 1.2kg
Compressed length
(valve open) 23.0mm 26.0mm
3.9mm
6.4
INTAKE EXHAUST
DIRECTION OF WINDINGS
(TOP TO BOTTOM)
Winding O.D. 15+ 0.3mm
0
21.6 0
- 0.3mm
~
I I 1

"B"
"C" seat width
"D" margin thickness
Stem diameter (O.D.)
Guide diameter (I.D.)
C I ea rance
(Cold engine)
" A " head diameter
0.1 6~ 0.20mm
36 + 0.2
1.3 ±0.15mm
1.2 ±0.2mm
7 + .010mm
-.025mm
7 + .019mm
-.010mm
I "B" face width 2.26 ± 0.57mm
" B " face width
"C" seat width
"D" margin thickness
Stem diameter (O.D.)
2.26 ± 0.57mm
1.3 ± 0.15mm
1.2±0.2mm
7 +.025mm
-.040mm
I Stem - to - guide clearance I 0.020~0.041mm I
EXHAUST
CI ea rance
(Cold engine) 0.2 1~0.25mm
" A " head diameter 31
+ 0.2mm
Guide diameter (I.D.)
7 + .019mm
St em -t o -g uid e clea ra nce 0.035~0.059mm
Cylinder and Piston
Cylinder material
Cylinder liner
Standard bore sizehtandard
Cylinder taper limit
Cylinder out - of - round limit
Piston clearancehtandard
maximum
maximum
Piston Rings
Design
End gap (installed)
Side clearance
Aluminum
Pressed in; special cast iron
68.00~68.02mm / (2.677~2.678 in.)
68.10mm (2.681)
0.05mm (.002 in.)
0.01mm (.0004 in.)
0.050~0.055mm / (.0020~.0022 in.)
0.1mm (.004 in.)
Oil
0.04-0.08mm 0.03-0.07mm
-0.4mm -0.4mm 0.2~0.9mm

Crankshaft and Connecting Rods:
Main bearing oil clearance
Rod bearing oil clearance
Main journalrun - out (maximun)
Oil Pump
Housing - to - outer rotor clearance
Outer rotor - to - inner rotor clearance
Clutch
Friction plate thickness standard
minimum
Clutch plate warp maximum
Clutch spring length standard
minimum
Clutch push rod run
- out maximum
Clutch lever freeplay (end of lever)
Transmission shaft run - out maximum
Middle gear case lash
0.022~0.044mm (.0009~.0017 in.)
0.032~0.054mm (.0013~.0021 in.)
0.03mm (.0012 in.)
,090~.015mm (.0035~.0059 in.)
.03 ~.09mm (.0011~.0035 in.)
3.0mm (0.12 in.)
2.8mm (0.11 in.)
0.05mm (.002 in)
42.8mm (1.685 in.)
41.5mm (1.634 in.)
0.4mm (.016in.)
13~26mm (0.5~1.0 in)
.08mm (.001 in.)
0.1 ~0.2mm (.004~.008 in.)
2. Carburetion
I
Manufacturer
Model, I. D. No.
Main jet
Needle jet
Pilot jet
Starter jet
Jet needles
/ Clip position
Mikuni
BS34,1J701
No. 145
Y - 2
No. 17.5
No. 45
4H11/3
Float level
Pilot screw
Air jet, Main
Air jet, Pilot
Throttle valve
Inlet valve size
Engine idle speed
26.5 ±2.5mm (fromgasket surf
2"turns
1 .0mm
1.6mm
No. 140
2.0mm
1050 ~ 1150 r.p.m.

3. Chassis
Ignition timing retarded
ad va nced
advance starts
Wheels and Tires
Rim run - out, vertical
Rim run - out, horizontal
Tire pressure, front, normal riding
High speed or with passenger
Tire pressure, rear,normal riding
High speed or with passenger
Brakes
Recommended fluid
Pad thickness wear limit
Brake disc maximum deflection
Brake disc minimum thickness
Front brake freeplay (end of lever)
Rear brake freeplay (end
of pedal)
Minimum boiling point
10° @ 1100 rpm
38.5° ± 1.5°@ 2,900 rpm
1550 + 200rpm
0
Front forks
Spring (upper) free length
Spring (lower) free length
Spring rate
(0~100 mm travel)
Fork oil capacity (each side)
preload length
preload length
(100~175mm travel)
Rear shock absorbers
Spring free length
Spring preload length
Spring rate (0~45mm travel)
(45~75mm travel)
2.0mm (.080 in.)
l.0mm (.040in.)
1.8 (26 p.s.i.)
2.0 kg/cm2 (28 p.s.i.)
2.0 kg/cm2 (28 p.s.i.)
2.3 kg/cm2 (33 p.s.i.)
DOT No.3
240°C (464°F)
5.5mm (0.18 in.)
0.15mm (.006 in.)
6.5mm (0.26 in.)
5.0~10.0mm (0.2~0.4 in.)
5.0~10.0mm (0.2~0.4 in.)
~~
55.8mm (2.2 in.)
50.8mm (2.0 in.)
448.3mm (17.65 in.)
423.3mm (16.67 in.)
0.5 kg/mm (28 Ibs/in.)
0.6 kg/mm (33.6 Ibs./in.)
170cc (5.75 US fl. oz.)
253mm (9.95 in.)
228 mm (9.0 in.)
1.9 kg/mm (106 Ibs./in.)
2.6 kg/mm (145 Ibs./in.)
Spark plug
Electrode gap
NGK BP - 7ES or ChampionN - 7Y
0.7~ 0.8mm (.028~.032 in)
Spark plug cap resistance I 5.0 K ohms
Contact point gap
Spring tension
0.3~0.4mm (.012 ~.016 in)
750 ± 100 g (26.5 ±3.5 oz)
Condenser capacity
Insulation resistance
0.22µF ± 10%
10 M ohms or more
Ignition coil type
Spark gap6V
12V
Primary resistance (20°C)
Secondary resistance (20°C)
H itach i CM1 1 - 52A
6mm @ 100 rpm
7mm @ 5,000 rpm
4.0 ± 0.4 ohms
11.0 ± 1.1K ohms

Starter motor type
Armature coil resistance (2O°C)
Field coil resistance (2O°C)
Brush length standard
minimum
Brush spring pressure
Armature mica undercut
Battery type
Charging rate
Generator
type
No load voltage
Field (inner) coil resistance(20°C)
Stator (outer) coil resistance (20°C)
Regulator type
Reg ulated vo I t age
Core gap
Yoke gap
Point gap
Starter relay switch
Cut - in voltage
Winding resistance (20°C)
Lighting
Headlight
Ta i IIight/stopIight
License light
FlasherI ig ht
Flasher pilot light
Meter Iights
High beam indicator light
Oil pressure warning light
Neutral light
~~~
Mitsuba SM
- 224C
0.007 ohms
0.01 ohms
12.5mm (0.5 in)
5.5mm (0.22 in)
620 ± 60g (22.0 ± 2.0 oz)
0.5 ~ 0.8mm (0.02 ~ 0.03 in)
Yuasa YB 14L
1.4 amps for 10 hours
Hitachi Ld 120 - 02
14.5 ± 0.5V
0.48 ± 0.05 ohms
4.04 ± 0.4 ohms
Hitachi TLIZ - 80
14.5 ± 0.5V
0.6 ~ 1 .0mm (.024 ~.040 in)
0.9mm (.035 in)
0.3 ~ 0.4mm (.012 ~.016 in)
Hitachi A104 - 70
6.5 V
3.5 ohms
Sealed beam 12V50/40W
12V 8/27W (two bulbs)
12V27W (four bulbs)
12V 3.4W (two bulbs)
12V 3.4W (two bulbs)
1 2 v 3.4w
1 2 v 3.4w
1 2 v 3.4w
1 2 v 8W

C. Torque Specifications
Spark plug
Cam cap nut
Rod cap
Starter clutch bolt
I Engine
1.5 ~ 2.5m - kg (11.0 ~18.0 ft - lbs.)
0.8 ~ 1 .O m - kg (6.0 ~ 7.0 ft - lbs.)
3.8m - kg (27 ft - lbs.)
2.8 ~ 3.2m - kg (20~ 23 ft - lbs.)
Shift cam locating bolt
Detent assembly
1.3 ~ 2.1m - kg (9 ~ 15 ft - lbs.)
4.0 ~ 4.5m - kg (29 ~ 32 ft - lbs.)
Transmission bearing caps
Crankcase bolts 8mm
1.8 ~ 2.2m - kg (13 ~ 16 ft - lbs.)
2.0 rn-kg (14 ft-lbs.)
10mm
Clutch holding nut
Clutch spring screws
3.7m - kg (27 ft - lbs.)
8 m-kg (58 ft-lbs)
0.8 ~ 1 .O m - kg (6.0 ~ 7.0 ft - lbs.)
Middle gear case mounting screws
Rotor holding bolt
2.0 ~ 2.5m - kg (14 ~ 18 ft - lbs.)
3.0 ~ 4.0m - kg (22 ~ 29 ft - lbs.)
Bearing housing bolt
Oil pipe union bolt
12mm I 8.0 ~ 11.0m - kg (58 ~ 80 ft - lbs.)
2.0 ~ 2.4m - kg (14 ~ 17 ft - lbs.)
2.0 ~ 2.2m - kg (14 ~ 16 ft - lbs.)
Oil pump drive gear nut
Crankshaft turning nut
Cylinder head 8mm
8.0 ~ 12.0m - kg (58 ~ 87 ft - lbs.)
1.5 ~ 2.9m - kg (11 ~ 21 ft - lbs.)
2.0m - kg (14 ft - lbs.)
I 1
10mm
Cylinder holding nuts
3.5m - kg (25 ft - lbs.)
2.0m - kg (14 ft - lbs.)
Camshaft capnuts
Engine mounting bolts 10mm
1 .O m - kg (7 ft - lbs.)
5.0 ~ 6.0m - kg (36 ~ 43 ft - lbs.)
Engine oil drain plug
Oil filter mounting bolt
Middle gear drain plug
Front axle nut
Frontaxle holder nuts
Rear axle nut
Rear axle pinch bolt
Chassis
3.9 ~ 4.7m - kg (28 ~ 34 ft - lbs.)
3.0 ~ 3.4m - kg (22 ~ 25 ft - lbs.)
3.9 ~ 4.7m - kg (28 ~ 34 ft - lbs.)
7.0 ~ 10.0m - kg (50 ~ 72 ft - lbs.)
1.3 ~ 2.3m - kg (9 ~ 17 ft - lbs.)
12.0 ~ 18.0m - kg (87 ~ 130 ft - lbs.)
0.45 ~ 0.75m - kg (3.0 ~ 5.0 ft - lbs.)
Brakes
Caliper support bolt
Caliper mounting bolt
Brakehoseunion bolt
Disc mounting bolt
Front fork pinch bolt
Steering stem top bolt
Swing arm pivot lock nut
Rear shock absorber nut
1.5 ~ 2.0 m-kg (11 ~ 15 ft-lbs.)
4.5 ~ 5.0m - kg (28~ 35 ft - lbs.)
2.3 ~ 2.8m - kg (16 ~ 20 ft - lbs.)
1.7 ~ 2.2m - kg (12 ~ 16 ft - lbs.)
1.3 ~ 2.3 m-kg (9 ~ 17 ft-lbs.)
6.6 ~ 10.5m - kg (48~ 76 ft - lbs.)
8.0 ~ 10.0m - kg (58 ~ 72 ft - lbs.)
2.3 ~ 3.7m - kg (20 ~ 27 ft - lbs.)

Components should be room temperature.
500 - 600