Honda · Honda Super Cub / Passport / C70 / C90 (1958-)

C50 / C70 / C90 / Passport / Super Cub (OHC)

Library entry covers 1966-2026

24 factory 44 guideline

Published source

Honda C70 Shop Manual (Honda Motor Co., issue May 1980), Maintenance Schedule p.1-8

Factory workshop manual. Covers C70 1980-1982 (shop manual issued May 1980).

Open the source

68 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: Centrifugal (slinger / rotor) filter
Valve gear: Overhead cam, screw/locknut adjusters
Ignition: Magneto (incl. magdyno, flywheel magneto)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Single carburetor
Cooling: Air / oil cooled
Primary drive: Gear or chain inside engine, shares engine oil
Gearbox oil: Shares engine oil
Clutch control: Automatic or semi-automatic
Final drive: Chain
Front suspension: Leading link / Earles fork
Rear suspension: Swingarm, twin shocks
Front brake: Drum (or band / stirrup)
Rear brake: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

1975 Honda C50 / C70 / C90 / Passport / Super Cub (OHC)

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 tire pressures

Pre-ride / on the road

Guideline
Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Drive chain: inspect, lubricate. Factory: Chart p.1-8: I, L every 300 mi (500 km)

On the road: every 600 mi

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

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 2,500 mi

2 items

Check lights, horn, brake light switches

Pre-ride / on the road

Factory

Manual: Brake light switch / headlight aim: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Walk-around: check nuts and bolts for vibration loosening

Pre-ride / on the road

Factory

Manual: Nuts, bolts, fasteners: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi

Every 1,000 mi or 6 months

3 items

Adjust front drum brake

Brakes

Guideline
Adjust rear drum brake and rod / cable linkage

Brakes

Guideline
Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 1,250 mi or 12 months

1 item

Change engine oil

Engine

Factory

Manual: Engine oil: replace. Factory: Chart p.1-8: R at 600 mi, then every 1,250 mi (2,000 km) or yearly

Every 1,250 mi

1 item

Check engine breather and oil return

Engine

Factory

Manual: Crankcase breather: clean. Factory: Chart p.1-8: clean every 1,250 mi (2,000 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 2,000 mi or 12 months

3 items

Inspect, clean and gap spark plugs

Engine

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline
Lubricate control cables and lever pivots

Controls and cables

Guideline

Every 2,500 mi or 1 month

1 item

Check battery electrolyte, top up with distilled water

Ignition and electrics

Factory

Manual: Battery: inspect. Factory: Chart p.1-8: monthly and at each interval

Every 2,500 mi

16 items

Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Replace spark plugs

Engine

Factory

Manual: Spark plug: replace. Factory: Chart p.1-8: R every 2,500 mi (4,000 km)
Carburetor choke: inspect

Fuel and air

Factory

Factory: Chart p.1-8: I every 2,500 mi
Carburetor idle speed: inspect

Fuel and air

Factory

Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Clean / inspect air filter

Fuel and air

Factory

Manual: Air cleaner: clean. Factory: Chart p.1-8: C at 2,500 and 5,000 mi; more often in dust
Replace fuel lines

Fuel and air

Factory

Manual: Fuel lines: inspect. Factory: Chart p.1-8: I every 2,500 mi
Check / set ignition timing

Ignition and electrics

Factory

Manual: Ignition timing: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

Factory

Manual: Contact breaker points: inspect. Factory: Chart p.1-8: I at 600, 2,500, 7,500 mi; R at 5,000 mi
Adjust automatic / semi-automatic clutch

Primary and gearbox

Factory

Manual: Clutch: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Cam chain tension: adjust

Final drive

Factory

Factory: Chart p.1-8: A at 600 mi then every 2,500 mi
Grease leading link pivots, check bushes and shocks

Front end

Factory

Manual: Suspension: inspect, lubricate. Factory: Chart p.1-8: I at 600 mi; I, L every 2,500 mi
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side stand: inspect. Factory: Chart p.1-8: I every 2,500 mi
Brake system: inspect

Brakes

Factory

Factory: Chart p.1-8: I at 600 mi then every 2,500 mi
Replace brake linings / skim drums (wear based)

Brakes

Factory

Manual: Brake shoe wear: inspect. Factory: Chart p.1-8: I every 2,500 mi
Check spoke tension and wheel true

Wheels and tires

Factory

Manual: Wheels/spokes: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi; dealer only

Every 3,000 mi or 12 months

8 items

Check engine mounting bolts and plates

Engine

Guideline
Clean oil strainers / mesh screens

Engine

Guideline

Often done with every oil change on old machines.
Clean fuel tap filter / sediment bowl

Fuel and air

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
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

1 item

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

3 items

Clean centrifugal oil filter (rotor / slinger)

Engine

Guideline
Lubricate and check automatic advance unit

Ignition and electrics

Guideline
Magneto: clean slip ring and pickup brush, check HT lead

Ignition and electrics

Guideline

Every 7,500 mi

2 items

Replace air filter element

Fuel and air

Factory

Manual: Air cleaner: replace. Factory: Chart p.1-8: R at 7,500 mi (12,000 km)
Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings: inspect. Factory: Chart p.1-8: I at 600 and 7,500 mi; dealer only

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 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 25,000 mi or 10 years

1 item

Magneto overhaul / re-magnetize, replace capacitor

Ignition and electrics

Guideline

Weak spark when hot is the classic symptom. Old capacitors fail with age, not miles.

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

3 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

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.