Honda · Honda SOHC four (CB350F-CB750 1969-1978)

CB750 Four (K0-K8, F)

Library entry covers 1969-1978

34 factory 42 guideline

Published source

Honda CB 750 Four K2 Manuel du conducteur (1972), factory owner's manual, French

Factory owner's handbook. Covers 1972 (CB750 Four K2, French-market owner's manual).

Open the source

76 items for a 1975 model, grouped by interval the way a factory chart is laid out.

How this bike is built (what the schedule is based on)

Engine cycle: Four-stroke
Engine lubrication: Dry sump (separate oil tank)
Oil filtration: Replaceable cartridge or spin-on filter
Valve gear: Overhead cam, screw/locknut adjusters
Ignition: Battery and coil with contact points
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Two or more carburetors
Cooling: Air / oil cooled
Primary drive: Gear or chain inside engine, shares engine oil
Gearbox oil: Shares engine oil
Clutch control: Hand lever, cable
Final drive: Chain
Front suspension: Telescopic fork
Rear suspension: Swingarm, twin shocks
Front brake: Disc, hydraulic
Rear brake: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

1975 Honda CB750 Four (K0-K8, F)

On the road: every 200 mi

1 item

Check engine oil level

Pre-ride / on the road

Guideline

Each fuel stop on old machines. Dry sump: check the tank hot, engine idling or just stopped, per your manual.

On the road: every 300 mi

1 item

Check tire pressures

Pre-ride / on the road

Guideline

On the road: every 497 mi

2 items

Check chain slack and rear wheel alignment

Pre-ride / on the road

Factory

Manual: Reglage du mou de chaine. Factory: Text: after first 500 km, then at least every 800 km
Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Chaine de transmission: entretien. Factory: Text p.52: inspect and service at least every 800 km

On the road: every 500 mi

1 item

Walk-around: check nuts and bolts for vibration loosening

Pre-ride / on the road

Guideline

Old machines shake things loose: exhaust nuts, mudguard stays, footrests, tank mounts, battery strap.

On the road: every 1,000 mi

1 item

Check road kit: plugs, points file, master link, tube patches, wire, tape

Pre-ride / on the road

Guideline

On the road: every 3,107 mi or 6 months

1 item

Check lights, horn, brake light switches

Pre-ride / on the road

Factory

Manual: Lumieres, compteur, avertisseur: controle. Factory: Chart p.32: every 6 mo/5,000 km

Every 1,500 mi or 6 months

1 item

Clean drive chain thoroughly (remove and soak, re-lube)

Final drive

Guideline

Non O-ring chains on old machines: remove, clean, soak in hot chain grease or lube, refit with the master link clip closed end leading.

Every 1,864 mi

1 item

Change engine oil

Engine

Factory

Manual: Vidange du moteur. Factory: Chart p.31: initial 1,000 km, then every 3,000 km; km-only manual

Every 2,000 mi or 12 months

1 item

Lubricate control cables and lever pivots

Controls and cables

Guideline

Every 3,000 mi or 12 months

9 items

Adjust cam chain tensioner

Engine

Guideline
Check engine mounting bolts and plates

Engine

Guideline
Adjust clutch pushrod / clutch adjuster

Primary and gearbox

Guideline
Check chain guard, chain oiler (if fitted), rear chain case

Final drive

Guideline
Inspect chain and sprockets for wear (measure stretch)

Final drive

Guideline
Check steering damper (friction or hydraulic)

Front end

Guideline
Inspect fork seals, stanchions and fork boots

Front end

Guideline
Check footrests, pegs, rear brake and gear lever pivots

Rear suspension and frame

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 3,107 mi or 6 months

21 items

Check and adjust valve clearances

Engine

Factory

Manual: Jeu des soupapes, controle ou reglage. Factory: Chart p.31: initial 1,000 km, then every 6 mo/5,000 km
Inspect, clean and gap spark plugs

Engine

Factory

Manual: Nettoyage, reglage ou remplacement des bougies. Factory: Chart p.31: at 5,000 and 10,000 km, repeat every 6 mo/5,000 km
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Controle de la commande d'accelerateur. Factory: Chart p.31: every 6 mo/5,000 km
Clean fuel tap filter / sediment bowl

Fuel and air

Factory

Manual: Nettoyage de la crepine de robinet d'essence. Factory: Chart p.31: every 6 mo/5,000 km
Synchronize carburetors

Fuel and air

Factory

Manual: Controle et reglage des carburateurs. Factory: Chart p.31: every 6 mo/5,000 km
Check / set ignition timing

Ignition and electrics

Factory

Manual: Calage de l'allumage, controle ou reglage. Factory: Chart p.31: initial 1,000 km, then every 6 mo/5,000 km
Check battery electrolyte, top up with distilled water

Ignition and electrics

Factory

Manual: Niveau de l'electrolyte de batterie. Factory: Chart p.32: initial 1,000 km, then every 6 mo/5,000 km
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Factory

Manual: Reglage ou remplacement des rupteurs. Factory: Chart p.31: at 5,000/10,000 km, repeat every 6 mo/5,000 km
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Controle ou reglage de l'embrayage. Factory: Chart p.31: initial 1,000 km, then every 6 mo/5,000 km
Replace chain and sprockets (wear based)

Final drive

Factory

Manual: Chaine et pignons: tension, lubrification ou remplacement. Factory: Chart p.31: initial 1,000 km, then 6 mo/5,000 km
Tension de la chaine de distribution

Final drive

Factory

Factory: Chart p.31: initial 1,000 km, then every 6 mo/5,000 km
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Controle des ressorts de bequille. Factory: Chart p.32: every 6 mo/5,000 km
Grease swingarm pivot

Rear suspension and frame

Factory

Manual: Graissage des bagues de bras oscillant arriere. Factory: Chart p.32 and text p.74: every 6 mo/5,000 km
Adjust rear drum brake and rod / cable linkage

Brakes

Factory

Manual: Pedale de frein arriere: reglage. Factory: Chart p.32: initial 1,000 km, then every 6 mo/5,000 km
Check brake pads and discs

Brakes

Factory

Manual: Plaquettes de frein avant, controle ou remplacement. Factory: Chart p.32: every 6 mo/5,000 km
Inspect brake hoses; replace old rubber

Brakes

Factory

Manual: Canalisation de frein: controle. Factory: Chart p.32: every 6 mo/5,000 km
Check spoke tension and wheel true

Wheels and tires

Factory

Manual: Controle des jantes et des rayons. Factory: Chart p.32: initial 1,000 km, then every 6 mo/5,000 km
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Controle ou remplacement des pneumatiques. Factory: Chart p.32: every 6 mo/5,000 km
Controle des biellettes de frein arriere

Controls and cables

Factory

Factory: Chart p.32: every 6 mo/5,000 km
Controle du reservoir et des canalisations d'essence

Controls and cables

Factory

Factory: Chart p.31: every 6 mo/5,000 km
Niveau du liquide de frein: controle

Controls and cables

Factory

Factory: Chart p.32: initial 1,000 km, then every 6 mo/5,000 km

Every 3,728 mi

1 item

Replace oil filter

Engine

Factory

Manual: Remplacement du filtre a huile. Factory: Chart p.31: initial 1,000 km, then every 6,000 km

Every 4,000 mi or 12 months

2 items

Replace spark plugs

Engine

Guideline
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 5,000 mi or 2 years

1 item

Check cylinder head bolt torque

Engine

Guideline

Air-cooled iron and alloy engines can lose head bolt tension; follow your manual's sequence and whether it is done hot or cold.

Every 6,000 mi or 12 months

5 items

Clean carburetor float bowl(s), check float level and jets

Fuel and air

Guideline

Ethanol fuel varnishes old carbs quickly in storage.
Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

Rear suspension and frame

Guideline
Inspect rear shocks for leaks and damping

Rear suspension and frame

Guideline
Lubricate speedometer / tachometer cables, check drive

Controls and cables

Guideline

A dry speedo cable whips the needle and eventually kills the instrument.

Every 6,000 mi or 2 years

2 items

Check engine breather and oil return

Engine

Guideline
Lubricate and check automatic advance unit

Ignition and electrics

Guideline

Every 6,214 mi or 12 months

7 items

Clean / inspect air filter

Fuel and air

Factory

Manual: Nettoyage du filtre a air. Factory: Chart p.31: first at 5,000 km, repeat every 12 mo/10,000 km
Replace air filter element

Fuel and air

Factory

Manual: Remplacement du filtre a air. Factory: Chart p.31: at 10,000 km, repeat every 12 mo/10,000 km
Change fork oil

Front end

Factory

Manual: Remplacement de l'huile de fourche avant. Factory: Chart p.32 and text p.72: every 12 mo/10,000 km
Check steering head bearing adjustment

Front end

Factory

Manual: Paliers de direction: controle ou reglage. Factory: Chart p.32: every 12 mo/10,000 km
Replace brake linings / skim drums (wear based)

Brakes

Factory

Manual: Garnitures de frein arriere: controle ou remplacement. Factory: Chart p.32: every 12 mo/10,000 km
Controle de l'huile de fourche avant

Controls and cables

Factory

Factory: Chart p.32: at 5,000 km, then every 12 mo/10,000 km
Controle de la pression d'huile moteur

Controls and cables

Factory

Factory: Chart p.31: at 12 mo/10,000 km, repeat every 12 mo/10,000 km; text p.35 says 6,000 km

Every 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 12,000 mi or 3 years

1 item

Replace points and condenser

Ignition and electrics

Guideline

Every 12,427 mi or 2 years

1 item

Clean oil strainers / mesh screens

Engine

Factory

Manual: Nettoyage de la crepine d'huile moteur. Factory: Chart p.31: every 24 months or 20,000 km

Every 15,000 mi or 5 years

1 item

Inspect clutch plates and springs

Primary and gearbox

Guideline

Every 20,000 mi or 4 years

2 items

Repack / replace steering head bearings

Front end

Guideline

Many old machines use loose balls in cups and cones. Taper roller conversions are common.
Repack / replace wheel bearings

Wheels and tires

Guideline

Cup-and-cone and taper roller hubs need periodic repacking and adjustment.

Every 25,000 mi or 6 years

1 item

Replace swingarm bushes / bearings

Rear suspension and frame

Guideline

Every 30,000 mi or 6 years

1 item

Rebuild forks: seals, bushes, springs

Front end

Guideline

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 12 months

1 item

Check speedometer / odometer against a known distance

Controls and cables

Guideline

Old speedos drift with tire size and drive wear. Use phone GPS over a measured 10 miles / km.

Every 2 years

4 items

Inspect fuel tank for rust, sealer failure, leaks

Fuel and air

Guideline
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Replace brake fluid

Brakes

Guideline

Every 4 years

2 items

Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Rebuild calipers and master cylinders (seals)

Brakes

Guideline

Every 6 years

2 items

Replace inner tubes and rim tape with tires

Wheels and tires

Guideline
Replace tires on age (regardless of tread)

Wheels and tires

Guideline

Guideline lines: Intervals here are general guidelines for the machine's era and layout, compiled for this app. They are not factory manual figures. Check your workshop manual, and edit any interval in the bike's Schedule tab.