Honda C50 / C70 / C90 / Passport / Super Cub (OHC) — Example photo: Derek A., CC BY 2.0, Wikimedia Commons

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Honda · Honda trail (CT90 / CT110 / Trail 90 1964-1986)

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

Library entry covers 1966-2026

27 factory 34 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).

61 items for a 2004 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

2004 Honda C50 / C70 / C90 / Passport / Super Cub (OHC)

On the road: every 300 km

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 500 km

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 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

On the road: every 4,000 km

1 item

Check lights, horn, brake light switches

Pre-ride / on the road

Factory

Manual: *BRAKE LIGHT SWITCH: inspect. Factory: Chart p.1-8: I at 600 mi then every 2,500 mi

Every 1,600 km 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 2,000 km 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 2,000 km

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 4,000 km 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 4,000 km

18 items

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
*HEADLIGHT AIM: inspect

Engine

Factory

Factory: Printed per the re-read doubt: *HEADLIGHT AIM is a separate row from *BRAKE LIGHT SWITCH, both I at every column; same columns as the existing brake light switch entry (I at 600 mi then every 2,500 mi). (From the re-read doubt notes: Honda C50 / C70 / C90 / Passport / Super Cub (OHC), printed line or second operation stated in the DOUBT line.)
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 5,000 km or 12 months

5 items

Clean fuel tap filter / sediment bowl

Fuel and air

Guideline
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.
Inspect chain and sprockets for wear (measure stretch)

Final drive

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 6,500 km or 12 months

2 items

Inspect, clean and gap spark plugs

Engine

Guideline
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 9,500 km or 12 months

6 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 control cables and lever pivots

Controls and cables

Guideline
Lubricate speedometer / tachometer cables, check drive

Controls and cables

Guideline

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

Every 9,500 km 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 12,000 km

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 16,000 km or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 19,500 km or 2 years

1 item

Grease swingarm pivot

Rear suspension and frame

Guideline

Every 29,000 km

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 32,000 km 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 40,000 km or 6 years

1 item

Replace swingarm bushes / bearings

Rear suspension and frame

Guideline

Every 40,000 km 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 2 years

2 items

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

No interval set

2 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Engine oil filter screen: clean. Factory: Chart p.1-8: C shown in 5,000 mi column only
Replace points and condenser

Ignition and electrics

Factory

Manual: Contact breaker points: replace. Factory: Chart p.1-8: R shown in 5,000 mi column

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.