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

CB350F / CB400F

Library entry covers 1972-1977

25 factory 45 guideline

Published source

Honda CB350F-CB400F Shop Manual (Honda Motor Co.), Maintenance Schedule p.104

Factory workshop manual. Covers CB350F/CB400F shop manual (1972-77 fours).

Open the source

70 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: Wet sump (oil in crankcase)
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 CB350F / CB400F

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

2 items

Check lights, horn, brake light switches

Pre-ride / on the road

Guideline
Check tire pressures

Pre-ride / on the road

Guideline

On the road: every 500 mi or 1 month

2 items

Check chain slack and rear wheel alignment

Pre-ride / on the road

Factory

Manual: Drive chain: check, lubricate, adjust. Factory: Maintenance schedule p.104: every month or 500 mi
Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Drive chain: check, lubricate, adjust. Factory: Maintenance schedule p.104: initial at 200 mi; every month or 500 mi

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

Every 1,000 mi or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 1,500 mi or 3 months

2 items

Change engine oil

Engine

Factory

Manual: Engine oil: change. Factory: Maintenance schedule p.104: initial at 500 mi; every 3 months or 1,500 mi
Check battery electrolyte, top up with distilled water

Ignition and electrics

Factory

Manual: Battery: check electrolyte, add water. Factory: Maintenance schedule p.104

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 2,000 mi or 12 months

1 item

Lubricate control cables and lever pivots

Controls and cables

Guideline

Every 3,000 mi or 6 months

17 items

Check and adjust valve clearances

Engine

Factory

Manual: Valve tappet clearance: check and adjust. Factory: Maintenance schedule p.104: dealer item; initial at 500 mi
Check engine breather and oil return

Engine

Factory

Manual: Paper air filter element and breather element: clean. Factory: Maintenance schedule p.104
Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark plug: clean and adjust gap or replace. Factory: Maintenance schedule p.104
Replace oil filter

Engine

Factory

Manual: Oil filter element: replace. Factory: Maintenance schedule p.104: initial at 500 mi
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation: inspect cable, adjust free play. Factory: Maintenance schedule p.104
Clean / inspect air filter

Fuel and air

Factory

Manual: Paper air filter element and breather element: clean. Factory: Maintenance schedule p.104: more often in dusty areas
Clean fuel tap filter / sediment bowl

Fuel and air

Factory

Manual: Fuel filter screen: clean. Factory: Maintenance schedule p.104: dealer item; fuel lines checked at the same interval
Synchronize carburetors

Fuel and air

Factory

Manual: Carburetor: check and adjust. Factory: Maintenance schedule p.104: dealer item
Check / set ignition timing

Ignition and electrics

Factory

Manual: Contact points and ignition timing: clean, check, adjust. Factory: Maintenance schedule p.104: dealer item
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Factory

Manual: Contact points and ignition timing: clean, check, adjust. Factory: Maintenance schedule p.104: dealer item; initial at 500 mi
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch: check operation and adjust. Factory: Maintenance schedule p.104: dealer item
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side stand: check. Factory: Maintenance schedule p.104: dealer item
Grease swingarm pivot

Rear suspension and frame

Factory

Manual: Rear fork bushing: grease, check looseness. Factory: Maintenance schedule p.104
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Front and rear suspension: check operation. Factory: Maintenance schedule p.104
Adjust rear drum brake and rod / cable linkage

Brakes

Factory

Manual: Brake control linkage: check and adjust free play. Factory: Maintenance schedule p.104
Check brake pads and discs

Brakes

Factory

Manual: Brake shoes/pads: inspect. Factory: Maintenance schedule p.104: dealer item
Check spoke tension and wheel true

Wheels and tires

Factory

Manual: Wheel rims and spokes: check, tighten and true. Factory: Maintenance schedule p.104: dealer item

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 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

8 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Oil filter screen: clean. Factory: Maintenance schedule p.104
Clean carburetor float bowl(s), check float level and jets

Fuel and air

Guideline

Ethanol fuel varnishes old carbs quickly in storage.
Replace air filter element

Fuel and air

Factory

Manual: Paper air filter element: replace. Factory: Maintenance schedule p.104
Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Change fork oil

Front end

Factory

Manual: Front fork oil: drain and refill. Factory: Maintenance schedule p.104: initial at 1,500 mi
Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings: adjust. Factory: Maintenance schedule p.104: dealer item
Check swingarm bushes for play

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

1 item

Lubricate and check automatic advance unit

Ignition and electrics

Guideline

Every 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 10,000 mi

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 12,000 mi or 3 years

1 item

Replace points and condenser

Ignition and electrics

Guideline

Every 15,000 mi or 5 years

1 item

Inspect clutch plates and springs

Primary and gearbox

Guideline

Every 15,000 mi

1 item

Replace brake linings / skim drums (wear based)

Brakes

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

3 items

Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Inspect brake hoses; replace old rubber

Brakes

Guideline
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.