Honda CRF 50 — Example photo: Christian Eiden, CC BY-SA 2.0, Wikimedia Commons

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

CRF 50

Library entry covers 2004-2025

20 factory 36 guideline

Published source

Honda CRF50F 2020 Owner's Manual 31GJGA20 (US market, English), Maintenance Schedule pp.49-50

Factory owner's handbook. Covers CRF50F; 2020 US (American Honda) owner's manual 31GJGA20, English.

Open the source

56 items for a 2006 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, single shock / cantilever
Front brake: Drum (or band / stirrup)
Rear brake: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2006 Honda CRF 50

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 or 3 months

1 item

Lubricate drive chain

Pre-ride / on the road

Factory

Manual: Drive chain (inspect, lubricate). Factory: Inspect and lubricate at 100 mi (150 km) / 1 month initial, then 'I, L: every 300 mi (500 km) or 3 month'; table cites 'Note 1' (text not on available pages)

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 600 mi

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 600 mi or 6 months

10 items

Change engine oil

Engine

Factory

Manual: Engine oil (replace). Factory: Initial replace at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first
Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance (inspect). Factory: Initial inspect at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first; dealer-recommended item (*)
Engine idle speed (inspect)

Engine

Factory

Factory: Initial inspect at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first; dealer-only item (**)
Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark plug (inspect). Factory: Inspect at 600, 1200, 1800, 2400 mi (1000-4000 km) / every 6 months, whichever comes first; no replace mark in schedule
Clean / inspect air filter

Fuel and air

Factory

Manual: Air cleaner (clean). Factory: Clean at 600, 1200, 1800, 2400 mi (1000, 2000, 3000, 4000 km) / 6, 12, 18, 24 months, whichever comes first; table cites 'Note 1' whose text is not on the pages available (likely a more-frequent service note for dusty conditions; not verified)
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch system (inspect). Factory: Initial inspect at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first
Drive chain slider (inspect)

Final drive

Factory

Factory: Inspect every 600 mi (1000 km) / 6 months, whichever comes first
Brake system (inspect)

Brakes

Factory

Factory: Initial inspect at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first
Check brake pads and discs

Brakes

Factory

Manual: Brake shoe wear (inspect). Factory: Inspect every 600 mi (1000 km) / 6 months, whichever comes first
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels/tires (inspect). Factory: Initial inspect at 100 mi (150 km) / 1 month, then every 600 mi (1000 km) / 6 months, whichever comes first; dealer-only item (**)

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 1,000 mi

1 item

Spark arrester (clean)

Engine

Factory

Factory: C: every 1,000 mi (1,600 km) or every 100 operating hours; dealer-recommended item (*)

Every 1,200 mi or 12 months

8 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Engine oil strainer screen (clean). Factory: Clean at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first; dealer-only item (**)
Nuts, bolts, fasteners (inspect)

Engine

Factory

Factory: Initial inspect at 100 mi (150 km) / 1 month, then at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months; dealer-recommended item (*)
Replace oil filter

Engine

Factory

Manual: Engine oil centrifugal filter (clean). Factory: Clean at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first; dealer-only item (**)
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation (inspect). Factory: Inspect at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first; dealer-recommended item (*)
Replace fuel lines

Fuel and air

Factory

Manual: Fuel line (inspect). Factory: Inspect at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first; dealer-recommended item (*: unless owner has tools, service data and is mechanically qualified)
Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings (inspect). Factory: Initial inspect at 100 mi (150 km) / 1 month, then at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months; dealer-only item (**)
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side stand (inspect). Factory: Inspect at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Suspension (inspect). Factory: Inspect at 1200 mi (2000 km) / 12 months and 2400 mi (4000 km) / 24 months, whichever comes first; dealer-recommended item (*)

Every 3,000 mi or 12 months

6 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 spoke tension and wheel true

Wheels and tires

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 6,000 mi or 12 months

4 items

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 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 12,000 mi or 2 years

4 items

Replace air filter element

Fuel and air

Guideline
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 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 16,000 mi or 4 years

1 item

Replace spark plugs

Engine

Guideline

Every 18,000 mi

1 item

Replace chain and sprockets (wear based)

Final drive

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 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.