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General Specifications
79 CB750K, CB750K LTD, CB750F, CB900F
80 CB750K, CB750C, CB750F, CB900F
81 CB750K, CB750C, CB750F
82 CB750K, CB750C, CB750F, CB750SC
(Courtesy of Mstspot, a handfull of old manuals, and an old houndog)
Dimensions Overall length
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Overall width
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Overall height
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Wheelbase
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Seat Height
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Ground clearance
CB750K
CB750K LTD
CB750C
CB750F
CB900F
Dry weight
CB750K
CB750K LTD
CB750C
CB750F
CB900F		 -----------------------
2200 mm (87.4 in)
2290 mm (90.2 in)
2300 mm (90.6 in)
2195 mm (86.4 in)
2240 mm (88.2 in)
-----------------------
880 mm (34.6 in)
880 mm (34.6 in)
919 mm (36.2 in)
865 mm (34.1 in)
795 mm (31.3 in)
-----------------------
1160 mm (45.7 in)
1160 mm (45.7 in)
1165 mm (45.9 in)
1140 mm (44.9 in)
1125 mm (44.3 in)
-----------------------
1520 mm (59.8 in)
1520 mm (59.8 in)
1526 mm (60.1 in)
1520 mm (59.8 in)
1515 mm (59.6 in)
-----------------------
800 mm (31.5 in)
785 mm (30.9 in)
759 mm (29.9 in)
810 mm (31.9 in)
815 mm (32.1 in)
-----------------------
150 mm (5.9 in)
145 mm (5.7 in)
129 mm (5.1 in)
140 mm (5.5 in)
150 mm (5.9 in)
-----------------------
233 kg (512 lb)
234 kg (516 lb)
232 kg (511 lb)
230 kg (507 lb)
233 kq (512 lb)
Frame Type
Front suspension, travel
Rear suspension, travel
Front tire size
Rear tire size
Cold
tire
pressures
Up to 90 kg
(200 lbs) load
Front: 
Rear:
Up to vehicle
capacity load
Front: 
Rear:
Front brake, lining swept area
Rear brake, lining swept area
Fuel capacity
Furel reserve capacity
Caster angle
Trail
Front fork oil capacity		 Double cradle
Telescopic fork, 160 mm (6.3 in)
Swing arm, 112 mm (4.4 in)
3.50H19 (4PR)
4.25H18 (4PR)
2.0 kg/cm² (28 psi)
2.25 kg/cm² (32 psi)
2.0 kg/cm² (28 psi)
2.8 kg/cm² (40 psi)
Disc brake, 306 cm² (47.43 sq in)
Internal expanding shoes, 218 cm² (33.79 sq in)
20.0 liters (5.3 US gal)
5.0 liters (1.3 US gal
62º30'
121 mm (4.8 in)
172.5-177.5 cc (5.8-6.0 ozs)
155 cc (5.2 ozs) at draining
Engine Type
Cylinder arrangement
Bore and stroke
CB750
CB900F
Displacement
CB750
CB900F
Compression ratio
CB750
CB900F
Valve train
Maximum horsepower
CB750
CB900F
Maximum torque
CB750
CB900F
Oil capacity
Lubrication sysetm
Air filtration
Cylinder compression
Intake valve: Opoens
CB750
CB900F
Intake valve: Closes
CB750
CB900F
Exhaust valve: Opens
CB750
CB900F
Exhaust valve: Closes
CB750
CB900F
Valve clearance
.
Engine weight
CB750
CB900F
Idle speed		 Air cooled 4-stroke
Vertical parallel four
-----------------------
62.0 x 62.0 mm (2.44 x 2.44 in)
64.5 x 69.0 mm (2.54 x 2.71 in)
-----------------------
749 cc (45.67 cu in)
901 cc (54.9 cu in)
-----------------------
9.0:1
8.8:1
Chain driven DOHC 4 valve
-----------------------
72 BHP/9,000 rpm
?????
-----------------------
6.4 kg-m (45.6 ft-lb) / 7,500 rpm
?????
4.5 liters (4.7 US qt)
Wet sump
Paper
12.0 +/- 1.0 kg/cm² (170 +/- 14 psi)
-----------------------
5º (BTDC) at 1 mm lift, 58º (BTDC) at 0 lift
10º (BTDC) at 1 mm lift, 62º (BTDC) at 0 lift
-----------------------
35º (ABDC) at 1 mm lift, 101º (ABDC) at 0 lift
35º (ABDC) at 1 mm lift, 90º (ABDC) at 0 lift
-----------------------
35º (BBDC) at 1 mm lift, 87º (BBDC) at 0 lift
40º (BBDC) at 1 mm lift, 93º (BBDC) at 0 lift
-----------------------
5º (ATDC) at 1 mm lift, 72º (ATDC) at 0 lift
5º (ATDC) at 1 mm lift, 70º (ATDC) at 0 lift
IN:
EX:
0.08 mm (0.003 in)
 +0.05mm (+0.002 in)
-0.02 mm (-0.001 in)
-----------------------
88.5 kg (195 lbs)
?????
1,000 +/- 100 rpm
Carburetion Carburetor type
Identification number
Pilot screw
Float level		 VB type, 30 mm (1.18 in) venturi bore
VB42A, VB42C
3/8 turns VB42A, 3/4 turns VB42C
15.5 mm (0.61 in)
Drive Train Clutch
Transmission
Primary reduction
.
Gear ratio I
Gear ratio II
Gear ratio III
Gear ratio IV
Gear ratio V
.
Final reduction
.
Gear shift pattern
Drive chain		 Wet, multi-plate
5-speed constant mesh
CB750: 2.382
CB900F: 2.041
2.533
1.789
1.391
1.160
CB750: 0.964
CB900F 1.000
CB750 2.533
CB900F 2.588
Left foot operated return system, 1 down 4 up
RK630SO or DID630V, 90 links
Electrical Ignition
Ignition timing "F-1" mark
Full advance
Starting system
Generator
Battery capacity		 Transistorized
10º BTDC at 1,000 rpm idle
40º BTDC at 6,000 rpm - 36º BTDC at 7,400 rpm
Starting motor only
Three phase A.C. generator 0.26 kw at 5,000 rpm
12V- 14AH
. Spark plug
(Canada model)
For cold climate
below
5ºC (41ºF)
Standard
For extended
high speed
driving
ND
NGK
ND
NGK
ND
NGK
x22es-u
d7ea
x24es-u
x24esr-u
d8ea
dr8es-l
x27es-u
d9ea
. Spark plug gap
Firing order
Fuse		 0.6-0.7 mm (0.024-0.028 in)
1-2-4-3
10A, 30A
Lights Headlight (high/low beam)
Tail/stoplight
Turn signal (front/rear)
Speedometer light
Tachometer light
Neutral indicator light
Turn signal indicator light
High beam indicator light		 65/50W sealed beam
3/32 cp SAE No. 1157
32/32 cp Front: SAE No. 1034, Rear: SAE No. 1073
2 cp SAE No. 57
2 cp SAE No. 57
2 cp SAE No. 57
2 cp SAE No. 57
2 cp SAE No. 57
.
Specific Torque Values - Engine
Item
Qty
Thread Dia. MM
Torque kg-m (ft-lb)
Remarks
Cylinder head cover
Cam holder
Cylinder head
Cam sprocket
Spark plug
Crankcase
A.C. generator
Primary shaft
Mainshaft
Drive sprocket
Connecting ron nut
Oil filter center bolt
Oil pressure switch
Neutral switch
Oil drain plug
Oil pipe
Spark advancer
Starting clutch
Oil filter bolt boss
8
24
12
4
4
.
1
1
1
1
12
1
1
1
1
2
1
3
1
6
6
10
7
.
8
12
12
16
10
.
.
.
.
14
10
8
8
.
0.8-1.2 (6-9)
1.2-1.6 (9-12)
3.6-4.0 (26-29)
2.2-2.6 (16-19)
1.2-1.6 (9-12)
2.1-2.5 (15-18)
8.0-10.0 (58-72)
8.0-10.0 (58-72)
3.8-4.2 (28-30)
5.0-5.4 (36-39)
3.0-3.4 (22-25)
2.8-3.2 (20-23)
1.5-2.0 (11-14)
1.6-2.0 (11-14)
3.5-4.0 (25-29)
3.1-3.5 (22-25)
3.3-3.7 (24-27)
2.6-3.0 (19-22)
3.5-4.5 (25-33)
 .
.
1
.
.
1
.
.
.
.
.
.
2
.
.
.
.
.
.
.
Specific Torque Values - Chassis
Item
Qty
Thread Dia. MM
Torque kg-m (ft-lb)
Remarks
Steering stem nut
Steering handlebar
Front fork top bridge
Front fork cap bolt
Front fork bottom bridge
Front axle holder
Front axle nut
Front brake disc
Brake hose bolt
Front brake caliper carrier
Front brake caliper A
Rear axle
Final driven sprocket
Swing arm pivot bolt
Rear brake torque link
Upper rear shock absorber
Lower rear shock absorber
Engine hanger bolt
.
Steering adjustment nut
Foot peg
Gearshift pedal
1
4
2
2
2
4
1
5
5
2
2
1
4
1
1
1
1
4
1
1
1
1
24
8
7
.
10
8
12
8
10
10
10
18
12
14
8
10
10
10
12
26
12
6
8.0-12.0 (58-87)
1.8-2.5 (13-18)
0.9-1.3 (7-9)
2.0-3.0 (15-22)
3.0-4.0 (22-29)
1.8-2.5 (13-18)
5.5-6.5 (40-47)
2.7-3.3 (20-24)
2.5-3.5 (18-25)
3.0-4.0 (22-29)
3.0-4.0 (22-29)
8.0-10.0 (58-72)
8.0-10.0 (58-72)
5.5-7.0 (40-51)
1.8-2.5 (13-18)
2.0-3.0 (15-22)
3.0-4.0 (22-29)
3.0-4.0 (22-29)
5.5-6.5 (40-48)
See Remarks, #4
5.5-6.5 (40-48)
0.8-1.2 (6-9)
 .
.
.
.
.
.
.
3
.
.
.
.
3
.
.
.
.
.
.
4
.
.
Remarks Codes for Tables Above:
1 = Apply molybdenum disulfied grease to threads and under side of nuts.
2 = Apply liquid sealant.
3 = UBS
4 = Tighten initially to 3.0-4.0 kg-m (22-29 ft-lb).
Then loosen and retighten to 10-20 kg-cm (0.7-1.4 ft-lb / 9-17 in-lb).
.
Standard Torque Values
Type
Torque kg-m (ft-lb)
Type
Torque kg-m (ft-lb)
5 mm bolt, nut
6 mm bolt, nut
8 mm bolt, nut
10mm bolt, nut
12 mm bolt, nut
0.45-0.6 (3.5-4.5)
0.8-1.2 (6-9)
1.8-2.5 (13-18)
3.0-4.0 (22.29)
5.0-6.0 (36-43)
5 mm screw
6 mm screw
6 mm flange bolt, nut
8 mm flange bolt, nut
10 mm flange bolt, nut
0.35-0.5 (2.5-3.6)
0.7-1.1 (5-8)
1.0-1.4 (7-10)
2.4-3.0 (17-22)
3.0-4.0 (22-29)
.
Shim Chart

CLICK HERE to download the PDF (zipped up)
.
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