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Honda · Overhead-cam four-stroke single, wet sump, gearbox shares engine oil, chain drive

Monkey 125

Library entry covers 2019-2025

23 factory 32 guideline

Published source

Honda 2024 Monkey Owner's Manual (31K0F), Maintenance Schedule pp.37-38

Factory owner's handbook. Covers 2024 manual (Monkey).

Open the source

55 items for a 2024 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: 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: Disc, hydraulic
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2024 Honda Monkey 125

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

3 items

Check lights, horn, brake light switches

Pre-ride / on the road

Guideline
Check tire pressures

Pre-ride / on the road

Guideline
Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Drive Chain. Factory: Every 300 mi (500 km): Inspect and Lubricate

On the road: every 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 5,000 km or 12 months

5 items

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
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 6,400 km or 12 months

1 item

Change engine oil

Engine

Factory

Manual: Engine Oil. Factory: R every column incl. 0.6, or 1 Year. Cols x1000mi 0.6/4/8/12/16/20/24

Every 6,400 km

13 items

Check and adjust valve clearances

Engine

Factory

Manual: Valve Clearance. Factory: I every column from 4
Check engine breather and oil return

Engine

Factory

Manual: Crankcase Breather. Factory: C every column from 4
Engine Idle Speed

Engine

Factory

Factory: I every column incl. 0.6
Headlight Aim

Engine

Factory

Factory: I every column from 4
Suspension

Engine

Factory

Factory: I every column from 4
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle Operation. Factory: I every column from 4
Fuel Line

Fuel and air

Factory

Factory: I every column from 4 (x1000mi)
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch System. Factory: I every column from 4
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side Stand. Factory: I every column from 4
Brake Light Switch

Brakes

Factory

Factory: I every column from 4
Brake System

Brakes

Factory

Factory: I every column from 4
Check brake pads and discs

Brakes

Factory

Manual: Brake Pads Wear. Factory: I every column from 4
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels/Tires. Factory: I every column from 4

Every 9,500 km or 12 months

6 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
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 12,800 km

6 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Engine Oil Strainer Screen. Factory: C at 8, 16, 24
Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark Plug. Factory: I at 4, 12, 20
Nuts, Bolts, Fasteners

Engine

Factory

Factory: I at 8, 16, 24
Replace oil filter

Engine

Factory

Manual: Engine Oil Filter. Factory: R at 8, 16, 24
Replace spark plugs

Engine

Factory

Manual: Spark Plug. Factory: R at 8, 16, 24
Check steering head bearing adjustment

Front end

Factory

Manual: Steering Head Bearings. Factory: I at 8, 16, 24

Every 16,000 km or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 19,200 km

1 item

Replace air filter element

Fuel and air

Factory

Manual: Air Cleaner. Factory: R at 12, 24

Every 19,500 km or 2 years

2 items

Synchronize throttle bodies

Fuel and air

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 24,000 km 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 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 38,500 km or 4 years

1 item

Replace fuel filter

Fuel and air

Guideline

Every 40,000 km or 6 years

1 item

Replace swingarm bushes / bearings

Rear suspension and frame

Guideline

Every 48,500 km 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

3 items

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

Factory

Manual: Brake Fluid. Factory: Inspect every 4,000 mi (6.4k km); Regular Replace 2 Years

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

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.