Honda · Overhead-cam four-stroke single, wet sump, separate gearbox oil, CVT belt drive

Metropolitan (49 cc)

Library entry covers 2004-2025

20 factory 36 guideline

Published source

Honda Metropolitan NCW50 2018 Owner's Manual 31GJB620 (US market, English), Maintenance Schedule pp.48-49

Factory owner's handbook. Covers NCW50 Metropolitan; 2018 US (American Honda) owner's manual 31GJB620, English.

Open the source

56 items for a 2021 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: Electronic (CDI / transistor / ECU)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Fuel injection
Cooling: Air / oil cooled
Primary drive: Gear or chain inside engine, shares engine oil
Gearbox oil: Separate gearbox oil
Clutch control: Automatic or semi-automatic
Final drive: Belt CVT, scooter automatic
Front suspension: Telescopic fork
Rear suspension: Swingarm, single shock / cantilever
Front brake: Drum (or band / stirrup)
Rear brake: Drum (or band / belt rim)
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2021 Honda Metropolitan (49 cc)

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

Every 1,000 mi or 6 months

2 items

Adjust front drum brake

Brakes

Guideline
Adjust rear drum brake and rod / cable linkage

Brakes

Guideline

Every 3,000 mi or 12 months

5 items

Adjust automatic / semi-automatic clutch

Primary and gearbox

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
Grease and check center / side stand and springs

Rear suspension and frame

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 4,000 mi or 12 months

3 items

Inspect, clean and gap spark plugs

Engine

Guideline
Inspect CVT drive belt, rollers / sliders and clutch shoes

Final drive

Guideline

Typical scooter interval. Your owner's manual figure governs; check belt width against the service limit.
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 4,000 mi

12 items

Change engine oil

Engine

Factory

Manual: Engine oil (replace). Factory: Replace at 600 mi (1.0k km) initial, then every 4000 mi (6.4k km)
Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance (inspect). Factory: Inspect every 4000 mi (6.4k km); dealer item (intermediate wrench)
Check engine breather and oil return

Engine

Factory

Manual: Crankcase breather (clean). Factory: Clean every 4000 mi (6.4k km); service more frequently when riding in rain or at full throttle
Engine idle speed (inspect)

Engine

Factory

Factory: Inspect at 600 mi (1.0k km) initial, then every 4000 mi (6.4k km); dealer item (intermediate wrench)
Headlight aim (inspect)

Engine

Factory

Factory: Inspect every 4000 mi (6.4k km)
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation (inspect). Factory: Inspect every 4000 mi (6.4k km) from 4000 to 24000 mi; dealer item (intermediate wrench)
Replace fuel lines

Fuel and air

Factory

Manual: Fuel line (inspect). Factory: Inspect every 4000 mi (6.4k km) from 4000 to 24000 mi; dealer item (intermediate wrench); emission-related
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Suspension (inspect). Factory: Inspect every 4000 mi (6.4k km); dealer item (intermediate wrench)
Brake lock operation (inspect)

Brakes

Factory

Factory: Inspect every 4000 mi (6.4k km); dealer item (intermediate wrench)
Brake system (inspect)

Brakes

Factory

Factory: Inspect every 4000 mi (6.4k km)
Check brake pads and discs

Brakes

Factory

Manual: Brake shoes wear (inspect). Factory: Inspect every 4000 mi (6.4k km)
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels/tires (inspect). Factory: Inspect every 4000 mi (6.4k km); dealer item (technical)

Every 5,000 mi or 12 months

1 item

Replace oil filter

Engine

Guideline

Every 6,000 mi or 12 months

5 items

Clean / inspect air filter

Fuel and air

Guideline

Mesh or oiled foam: clean and re-oil. Paper: blow out or replace. Some very early machines have no filter at all.
Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

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 8,000 mi

7 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Engine oil strainer screen (clean). Factory: Clean at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km)
Inspect coolant hoses and clamps

Engine

Factory

Manual: Cooling system (inspect). Factory: Inspect at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); dealer item (intermediate wrench)
Nuts, bolts, fasteners (inspect)

Engine

Factory

Factory: Inspect at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); dealer item (intermediate wrench)
Replace spark plugs

Engine

Factory

Manual: Spark plug (replace). Factory: Inspect at 4000/12000/20000 mi (6.4k/19.2k/32.0k km), replace at 8000/16000/24000 mi (12.8k/25.6k/38.4k km)
Replace air filter element

Fuel and air

Factory

Manual: Air cleaner (replace). Factory: Replace at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); service more frequently in unusually wet or dusty areas
Clutch shoes wear (inspect)

Primary and gearbox

Factory

Factory: Inspect at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); dealer item (technical)
Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings (inspect). Factory: Inspect at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); dealer item (technical)

Every 10,000 mi or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change gearbox oil

Primary and gearbox

Guideline

Every 12,000 mi or 2 years

3 items

Synchronize throttle bodies

Fuel and air

Guideline
Clean and grease rear suspension linkage

Rear suspension and frame

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 12,000 mi or 3 years

1 item

Replace CVT drive belt

Final drive

Guideline

Typical scooter interval, or sooner if the belt is cracked, glazed or below its width limit.

Every 15,000 mi or 3 years

1 item

Change fork oil

Front end

Guideline

Some early telescopic forks are grease filled or use very small oil quantities. Check your manual.

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 24,000 mi or 4 years

1 item

Replace fuel filter

Fuel and air

Guideline

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 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 3 years

1 item

Replace coolant

Engine

Factory

Manual: Radiator coolant (replace). Factory: Regular replace every 3 years; inspect at 8000, 16000, 24000 mi (12.8k, 25.6k, 38.4k km); replacement requires mechanical skill

Every 6 years

1 item

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.