12. Honda CB 750 K7 - FRONT WHEEL/SUSPENSION

~HONDA 12FRONT WHEEL/
SUSPENSION •
~ CB750

II 0 0 1.8-2.5kg-m

(5;;j , r(13.0-18.1ft-lbs)
. - - - II J = = J,r,

0.9-1.3kg-m ~ g ~ ~ - - 8.0-12.0kg-m
(6 .5 - 9 .9ft-lbs)
0.9-1 .3kg-m (57 .9 - 8 6 .Bft-lbs)

~ : : , - 9.4ft"bs)

©@

8.0-12 .0kg-m
(57.9-86.Bft-lbs)

~ 3.0- 4.0kg-m

(21 .7-28.9ft-lbs)

12-0

FRONT WHEEL/SUSPENSION ~HONDA

~ CB750

TROUBLESHOOTING 12-2
SERVICE INFORMATION 12-2
HEADLIGHT 12-4
SPEEDOMETER AND TACHOMETER 12-5
STEERING HANDLEBAR 12---s
FRONT WHEEL 12-7
FRONT FORK 12-13
STEERING STEM 12-20

12-1

~HONDA FRONT WHEEL/SUSPENSION

~ CB750

TROUBLESHOOTING

Hard Steering

1. Steering stem nut too tight
2. Defective steering stem bearings
3. Damaged steering stem ball race and/or cone race
4. Insufficient tire pressure

Steers to One Side or Does Not Track Straight
1. Unbalanced right and left shock absorbers
2. Bent front forks
3. Bent front axle: wheel installed incorrectly

Front Wheel Wobbing
1. Distorted rim
2. Worn front wheel bearing
3. Distorted wheel spokes
4. Defective tire
5. Axle not tightened properly

Soft Suspension
1. Weakened fork spring
2. Insufficient fluid in front forks

Hard Suspension
1. Incorrect fluid weight in front forks

Front Suspension Noise
1. Cushion case binding
2. Insufficient fluid level jn forks
3. Loose front shocks or springs

SERVICE INFORMATION

WORKING PRACTICE

Do not remove the rivets, nuts, and pins from the rim, spoke plate and hub, since they cannot be disassembled.
Never ride ori the rim or try to bend the wheel.
Avoid damaging the alminum alloy rim.

SPECIFICATIONS 0-0.05mm Standard Service Limit
0-1.0mm
Item 0-1 .0mm (0-0.002 in) 0.20mm (O.G08 in)
504.3mm (0-0.039 in) 2.0mm (0.0787 in)
Axle shaft trueness 0-0.1 mm (0-0.039 in) 2.0mm (0.0787 in)
Front wheel rim runout Radial 145-155cc (19.854 in) 495.0mm (19:488 in)
135-145 cc (0-0.004 in) 0.2mm (0.008 in)
Axial (4.8-5.2 oz) refill after disassembly
Front fork spring Free Length (4.5-4.8 oz) refill after draining
Front fork pipe trueness
Front tire size
Front fork oil capacity

SPECIAL TOOLS

RETAINER WRENCH 07910-3230101

BEARING DRIVER 07946-9350200

DRIVER HANDLE 07949-6110000

6 mm HOLLOW SET WRENCH 07917-3230000

WHEEL SEAL DRIVER 07947-3290000

48mm PIN SPANNER 07902-2000000

BOTIOM BALL RACE DRIVER 07946-3710400

12-2

FRONT WHEEL/SUSPENSION ~HONDA

~ CB750

TORQUE VALUES 8.0-12.0 kg-m (58-87 ft-lbs)
1.8-2.5 kg-m (13-18 ft-lbs)
Steering stem nut 0.9-1.3 kg-m (6.5-9.4ft-lbs)
Handlebar·upper holder bolts 3.0-4.0 kg-m (22-29 ft-lbs)
Fork top bridge bolt 5.5-6.5 kg-m (40-47 ft-lbs)
Fork bottom bridge bolt 2.8-3.3 kg-m (20-24 ft-lbs)
Axle nut 1.8-2.5 kg-m (13-18 ft-lbs)
Disc bolt 4.5-5.5 kg-m (33-40 ft-lbs)
Fork axle holder nut 3.0-4.0 kg-m (22-29 ft-lbs)
Fork bolt 0.9-1.3 kg-m (6.5-9.4 ft-lbs)
Caliper flange bolt
Top br_idge stem bolt

12-3

{;;;jj\HONDA. FRONT WHEEL/SUSPENSION

~ CB750

HEADLIGHT

HEADLIGHT CASE REMOVAL

Remove the headlight and disconnect all
wires at their couplers and connectors.

NOTE
It is necessary to hold the connectors
with pliers to prevent the wires from
being cut while operation.

To remove the headlight case, screw out
the right and left reflectors and headlight
stay mounts.

WIRING CONNECTION IN HEAD·
LIGHT CASE

Route the wires into the headlight case
through the headlight case hole.
Route the wire harness into the headlight
case through the headlight case lower hole.
Connect the wires color-to-color.
Set each coupler in its correct holder in the
headlight case.
For wiring procedure, see page 1-12.

HEADLIGHT INSTALLATION

Align the punch marks on the headlight
case with the punch marks on the headlight
case brackets. Position the turn signals
parallel to the ground.

NOTE
Check each component for operation
after assembling.

12-4

FRONT WHEEL/SUSPENSION ~ HONDA.

SPEEDOMETER AND ~ CB750
TACHOMETER

SPEEDOMETER AND
TACHOMETER REMOVAL

Remove the cable nuts and disconnect the
speedometer and tachometer cables.
Remove the two retaining nuts and lift off
the meter bracket with the speedometer,
the tachometer and the indicator assembly.
Remove the four nuts and separate the
speedometer and tachometer from the
bracket.

INSTRUMENT PANEL LIGHT
REPLACEMENT

The indicator bulbs can be removed by re- ,_ _,.....
moving the indicator panel cover attaching

screws.

If replacement bulbs do not come on, then
check the relative wirings for shorts, open
circuit, or loose connection.

SPEEDOMETER, TACHOMETER
AND METER LAMP REPLACEMENT

To remove the lamps , remove the
speedometer and tachometer under stays.
Remove the meter under plates and cables
to replace the meters.

12-5

W\ HONDA FRONT WHEEL/SUSPENSION

~ CB750

STEERING HANDLEBAR

HANDLEBAR REMOVAL

Remove the wire bands.
Remove the turn signal switch.
Remove the brake master cylinder.
Loosen the engine stop switch attaching
screws and remove the handlebar upper
holders, and the handlebar with the throttle
grip, the throttle cables and the engine stop
switch intact.

NOTE
Do not loosen the front brake hose
unless the brake requires servicing .

HANDLEBAR INSTALLATION

Installation is essentially the reverse of
removal.

NOTE
Apply grease to the throttle grip area
of the handlebar.

Position the handlebar on the lower holders
with the punch marks on the handlebar in
line with the top of the holders.
Place the upper holders on the handlebar
with the punch marks facing the front.

Torque the forward bolts first , then tighten
the rear bolts to the same torque.

Position the master cylinder holder with
the relief cut down and the lug in line with
the punch !"'lark on the handlebar.

Install the engine stop and turn signal
switches with the splits in the housings
aligned with the punch marks on the
handlebar.

12-6

FRONT WHEEL/SUSPENSION ~HONDA

FRONT WHEEL ~ CB750

FRONT WHEEL REMOVAL

Raise the front wheel off the _ground by
placing a padded block or safety stand
under the engine.
Remove the right brake caliper.
Remove the left brake caliper.

NOTE
The brake caliper removal is required
for "F" model only.

Disconnect the speedometer cable from
the speedometer gearbox.
Remove the left and right axle holders.

NOTE
Do not operate the front brake lever after
removing the front wheel. Failure to do
so will cause difficulty to fit the brake
disc between the brake pads.

AXLE INSPECTION

Set the axle on V-blocks and measure the
bend.
The actual bend is 1/2 of TIA (Total indi·
cator Reading).
SERVICE LIMIT: 0.2 mm (0.008 Im.)

12-7

~ HONDA FRONT WHEEL/SUSPENSION

~ CB750

WHEEL DISASSEMBLY-"F" Model (8) WHEEL BALANCE WEIGHT

Remove the right bearing first . I
Front wheel retainer wrench

07910-3230101

(9) APPLY ADHESIVE DURING ASSEMBLY

~

(6) FWD (5) SPEEDOMETER
GEAR
INOTE 2.8-3 .3 kg-m
The COMSTAR wheel has no tire flap.
~ (20.2~23.911-lbs)
WHEEL BEARING INSPECTION
~
Check the wheel bearing play by placing the
wheel in a truing stand and spinning the (1) PLAY
wheel by hand. Replace the bearing with a
new one if noisy or has excessive play.

12-8

FRONT WHEEL/SUSPENSION ~HONDA

~ CB750

WHEEL DISASSEMBLY-"K" model Balance weight installation

~~ (1) SPEEDOMETER GEAR
~

~ . ,,,.,...__

Align the balance mark with the tire valve.

FRONT WHEEL ASSEMBLY (1) BEARING DRIVER 07946-9350200
(2) DRIVER HANDLE 07949-6110000
Pack all bearing cavities with grease.
Drive in the bearings with the sealed end
facing up.
"F" MODEL: Drive in the right bearing first.
"K" MODEL: Drive In the left bearing first.

I NOTE
Drive the bearing squarely.

12-9

~HONDA FRONT WHEEL/SUSPENSION

~ CB750

Check the rim runout by placing the wheel
in a truing stand. Then spin the wheel by
hand, and read the runout by using a dial
indicator gauge.

SERVICE LIMITS:

RADIAL RUNOUT: 2.0 mm (0.0079 In.)
AXIAL RUNOUT : 2.0 mm (0.0079 In.)

NOTE
The COMSTAR WHEEL cannot be
repaired and must be replaced with a
new one if the service limits are
exceeded.

BRAKE DISC THICKNESS

Measure the disc plate thickness with a
micrometer.
SERVICE LIMIT:

"F" MODEL: 4.0 mm (0.1575 In.)
"K" MODEL: 6.0 mm (0.2362 In.)

BRAKE DISC RUNOUT

Measure the disc plate runout with a dial
indicator gauge.

SERVICE LIMIT: 0.30 mm (0.0118 In.)

12-10

FRONT WHEEL/SUSPENSION ~HONDA

Install the bearing retainer with the tool ~ CB750
"Retainer Wrench"and peen it over at two
points.

Install the distance collar and drive in the
bearing.

(1) RETAINER WRENCH 07910-3230101

Lubricate the inside of the dust seal with
grease:

"F" MODEL:

Install the dust seal and collar in the hub on
the right side.

"K" MODEL:

Install the dust seal and collar in the hub on
the left side.
NOTE
· The spoke plate bolts and nuts require

no retaining since they are secured
with lock pins.
· Do not remove these lock pins.

SPEEDOMETER GEAR RETAINER
INSTALLATION

"F" MODEL:

Install the speedometer gear retainer in the
hub from the right side.

"K" MODEL:

Install the speedometer gear retainer in the
hub from the left side.

Disassemble the speedometer gearbox.
Lubricate the gears and sliding faces.

Install the speedometer gear in the wheel
hub, aligning the speedometer gearbox
tangs with the notches in the retainer.

12-11

~HONDA FRONT WHEEL/SUSPENSION

~ CB750

FRONT WHEEL INSTALLATION

Insert the axle through the wheel hub from
the right side.
Torque the axle nut, noting the installation
direction of the speedometer gearbox.

TORQUE SPECIFICATION:
5.5-6.5 kg,m (40-47ft,lbs)

NOTE
Install the speedor1o:?ter gearbox
horizontally, being careful that there is
no sharp bend in the speedometer
cable.

Position the axle holder on the fork end
with the "F" mark facing the front.
Tighten the forward nut to the specified
torque first, then tighten the rear nut to the
same torque.

TORQUE SPECIFICATION:
1.8-2.5kg-m (13.0-18.1 ft-lbs)

NOTE
Place a stand under the engine to
remove load from the front fork. Keep
the handlebar straight ahead.

Install the right caliper holder.
Install the left caliper holder.

Connect the speedometer cable to the
speedometer gearbox while rotating the
wheel by hand.

Install the brake cable and adjust the brake
(Drum type only).
With the front brake applied, pump the
front fork up and down several times to
check for proper operation.
Recheck the installation of the axle holders
and adjust, if necessary.

12-12

\, ~ HONDA

FRONT WHEEL/SUSPENSION ~ CB750

FRONT FORK '

FRONT FORK REMOVAL I

Remove the front wheel (page 12-6). I
Remove the front brake caliper.
Remove the front fender. I.•

Loosen the bolts on the fork top and ! '.' .
bottom bridges.
t"!'
NOTE
Slightly loosen the fork bolt while it is 1
installed to facilitate disassembly.

Pull the assembly down and out while turn-
ing the fork tube.

12-13

~HONDA FRONT WHEEL/SUSPENSION
~ CB750

FRONT FORK DISASSEMBLY

Remove the fork bolt and the fork spring.

FRONT FORK SPRING FREE
LENGTH

Inspect the fork spring free length.
SERVICE LIMIT: 495.0 mm (19.4881n.)

Drain ATF from the fork pipe.

12-14

FRONT WHEEL/SUSPENSION ~HONDA

Remove the socket bolt reaching through ~ CB750
hole in the fork end.
Remove the fork pipes and bottom pipe.

NOTE
· Set the fork bottom case in the soft

jaws of a vise, being careful not to
tighten excessively.
· Temporarily install the spring and fork
bolt should difficulty be encountered
in removing the bolt.

(1) HOLLOW SET WRENCH (6mm)

07917-3230000

FORK PIPE/FORK BOTIOM CASE/ I
BOTIOM PIPE INSPECTION

Check the fork pipes, fork bottom cases
and pistons for evidences of score marks,
scratches, or excessive or abnormal wear,
replacing those which have any of the
above.

FORK PIPE INSPECTION

Set the fork pipe in V-blocks and read the
bend.
Take 1/2 TIA to determine the actual bend .
FORK PIPE BEND SERVICE LIMIT:

0.2 mm (0.008 In.)
FORK PIPE 0.0. SERVICE LIMIT :

34.900 mm (1.374 In.)

12-15

~HONDA. FRONT WHEEL/SUSPENSION

~ CB750

Remove the dust seal and pry off !he set
ring with the ring pliers.

(2) SET RING

OIL SEAL REMOVAL

Carefully lift the oil seal out with the dull
end of a screwdriver.

NOTE
Avoid damaging the inner and outer
surfaces of the bottom case while
removing the seal.

(2) OIL SEAL

(1) FORK BOTIOM CASE

BOTIOM CASE INSPECTION

Inspect the inside surface of the bottom
case for wear or damage.
Measure the bottom case 1.0.
SERVICE LIMIT: 35,250 mm (1.3878 In.)

12-16

FRONT WHEEL/SUSPENSION ~HONDA
~ CB750

• FRONT FORK ASSEMBLY

NOTE
Clean all removed parts in/with solvent
and wipe off excess solvent.

(3) FORK INNER BOLT ~

& ~(4)SPRINGSEAT

(2) REBOUND SPRING ~

(9) FORK BOTIOM CASE (8) FORK PIPE

1; ,fl (6) FORK BOTIOM PIPE

(10) SOCKETBO~I/J'-..

APPLY LIOU ID SEALER TO BOLT (7) 01 L LO CK PIECE

THREADS AND UNDERSIDE OF BOLT

Install the piston and fork pipe. (1)
Apply liquid sealer to the bolt threads and
underside of the bolt, then torque to
specified tension.

NOTE
Do not tighten the fork bottom case
excessively in a vise.

(2) HOLLOW SET WRENCH
(6mm) 07917-3230000

12-17

~ HONDA FRONT WHEEL/SUSPENSION
~ CB750

OIL SEAL INSTALLATION FORK SEAL DRIVER 07947-3290000

Drive the oil seal into position until the
stopper ring groove appears thoroughly.
Install the stopper ring and dust cover.

FILLING WITH SHOCK ABSORBER (1) HONDA ATF
OIL

Use HONDA ATF (Automatic Transmission
Fluid) to fill the front fork.
OIL CAPACITY: 145-155 CC (4.8-5.2 ozs)

NOTE
Pour the specified amount of ATF. Do
not overfill.

Install the fork spring and the 0-ring.
Tighten the fork bolt. .
TORQUE SPECIFICATION: 4.5-5.5 kg-m

(33-40 ft-lbs)

12-18

FRONT WHEEL/SUSPENSION ~HONDA

~ CB750

FRONT FORK INSTALLATION •-

Install the front fork into the fork top
bridge.

NOTE
Align the front for~ top end with the top
of the fork bridge.

Tighten the top bridge and bottom bridge
bolts.

TORQUE: TOP BRIDGE BOLT

0.9-1.3 kg-m (6.5-9.4 ft-lbs)

TORQUE: BOTTOM BRIDGE BOLT

3.0-4.0 kg-m (22-29 ft-lbs)

Install the front fender and the front wheel.
Install the brake caliper.

•

'i "

.i,,

i.•'

.i .

12-19

~ HONDA FRONT WHEEL/SUSPENSION
~ CB750

STEERING STEM

TOP BRIDGE REMOVAL

Remove the headlight.
Remove the instruments.

Remove the keys from the handlebar lock.
Remove the steering handlebar.
Remove the horn.
Remove the steering stem nut.

Loosen the steering stem bolt.
Loosen the fork top bridge bolts.
Remove the fork top bridge.

Remove the fork cover.

12-20

FRONT WHEEL/SUSPENSION ~ HONDA

~ CB750

Loosen the bottom bridge bolts.
Remove the front fork assembly.

HEAD TOP THREAD REMOVAL

NOTE
Do not drop the steel balls to prevent
them from being scattered and lost.

(1) 48 mm
PIN SPANNER

TOP/BOTIOM RACE DISASSEMBLY

~ (2) BOTTOM BALL RACE (l 2) TOP RACE (13) BOTTOM RACE
~ (3)STEEL BALLS 19pcs
rf{.___
~ (4) BOTIOM CONE RACE ~ [j-Z
~ (5) DUST SEAL

(6) STEERING STEM ~(8)TOP THREAD NUT

(7) BOTIOM BRIDGE BOLT ~ 9 ) TOP CONE RACE
~ - (10) STEEL BALLS 18pcs,
j ~ ( 1 1 ) TOP BALL RACE

(14) SPECIAL TOOL BALL RACE DRIVER SET
07946-3710400

12-21

~HONDA FRONT WHEEL/SUSPENSION

~ CB750

TOP/BOTTOM RACE ASSEMBLY (2) BOTIOM

NOTE
Drive in the top and bottom races
securely.

(3) BOTIOM BALL RACE DRIVER SET 07946-3710400

HEAD TOP THREAD TIGHTENING

Install the adjuster in the frame neck and
tighten it until snug against the top cone
race. Then, back it out 1/8 turn.
Make sure that there is no vertical
movement and the stem rotates freely.

TOP BRIDGE INSTALLATION

Install the front fork legs.
Position the fork tubes so that the upper
ends are even with the steering head
adjuster.

NOTE
J Do not mix the right and left fork legs.

Temporarily tighten the bottom bridge fork
bolts.

12-22