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Yamaha · Modern chain-drive motorcycle (2000-)

AG 125

Library entry covers 2018-2022

32 factory 34 guideline

Published source

Yamaha AG125 2026 Owner's Manual BF8-F8199-29 (Australia, English), periodic maintenance charts pp.7-3 to 7-6, TIPs pp.7-3 and 7-6

Factory owner's handbook. Covers AG125; 2026 Australia owner's manual BF8-F8199-29, English. Chart columns 1000/6000/12000/18000/24000 km (600/3500/7000/10500/14000 mi) plus annual check; from 30000 km (17500 mi) repeat the intervals starting from 6000 km (3500 mi); annual checks every year except if a distance-based maintenance is performed instead. Chart lists brake shoes front and rear (front brake cable adjust), drive chain; no oil filter row.

Open the source

66 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, shim adjusted (incl. desmo)
Ignition: Electronic (CDI / transistor / ECU)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Fuel injection
Cooling: Liquid 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: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2021 Yamaha AG 125

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

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

Guideline

Lube warm, ideally at the end of the riding day so it soaks in overnight. Sooner after rain.

On the road: every 500 mi

1 item

Check coolant level

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 300 mi

1 item

Clean drive chain thoroughly (remove and soak, re-lube)

Final drive

Factory

Manual: Drive chain (check chain slack, alignment and condition; adjust and lubricate chain with Yamaha chain lubricant or other suitable chain lubricant thoroughly). Factory: Every 500 km (300 mi) and after washing the motorcycle, riding in the rain or riding in wet areas, printed as text; not a dealer item (p.7-5)

Every 3,000 mi or 12 months

4 items

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

Every 3,500 mi or 12 months

15 items

Change engine oil

Engine

Factory

Manual: Engine oil (change, warm engine before draining; check oil level and vehicle for oil leakage). Factory: Every column incl. 1000 km (600 mi) initial; annual check; not a dealer item. No oil filter or strainer row in this chart (p.7-5)
Chassis fasteners (make sure all nuts, bolts and screws are properly tightened)

Engine

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; dealer item (p.7-5)
Idle speed (check and adjust engine idle speed)

Engine

Factory

Factory: Every column incl. 1000 km (600 mi) initial; annual check; dealer item (p.7-3)
Lights, signals and switches (check operation, adjust headlight beam)

Engine

Factory

Factory: Every column incl. 1000 km (600 mi) initial; annual check; dealer item (p.7-6)
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle grip housing and cable (check operation and free play, adjust throttle cable free play if necessary, lubricate throttle grip housing and cable). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; dealer item (p.7-6)
Replace fuel lines

Fuel and air

Factory

Manual: Fuel line (check fuel hose for cracks or damage, replace if necessary). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; dealer item (p.7-3)
Clutch lever pivot shaft (lubricate with lithium-soap-based grease)

Primary and gearbox

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; not a dealer item (p.7-5)
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Sidestands (check operation, lubricate with lithium-soap-based grease). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; not a dealer item (p.7-5)
Brake lever pivot shaft (lubricate with lithium-soap-based grease)

Brakes

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; not a dealer item (p.7-5)
Brake pedal pivot shaft (lubricate with lithium-soap-based grease)

Brakes

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; not a dealer item (p.7-5)
Check brake pads and discs

Brakes

Factory

Manual: Front brake (check operation, adjust cable, replace brake shoes if necessary). Factory: Every column incl. 1000 km (600 mi) initial; annual check; dealer item (p.7-4)
Front and rear brake switches (check operation)

Brakes

Factory

Factory: Every column incl. 1000 km (600 mi) initial; annual check; dealer item (p.7-6)
Rear brake (check operation, adjust brake pedal free play, replace brake shoes if necessary)

Brakes

Factory

Factory: Every column incl. 1000 km (600 mi) initial; annual check; dealer item (p.7-4)
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Tires (check tread depth and for damage, replace if necessary, check and correct air pressure). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; dealer item (p.7-4)
Lubricate control cables and lever pivots

Controls and cables

Factory

Manual: Moving parts and cables (lubricate). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; annual check; dealer item (p.7-6)

Every 3,500 mi

10 items

Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance (check and adjust). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; no annual check; dealer item (p.7-3)
Exhaust system (check for leakage, tighten if necessary, replace gasket if necessary)

Engine

Factory

Factory: Every column incl. 1000 km (600 mi) initial; no annual check; dealer item (p.7-3)
Air filter case check hose (clean)

Fuel and air

Factory

Factory: Every column incl. 1000 km (600 mi) initial; no annual check; not a dealer item (p.7-4)
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Factory

Manual: Clutch (check operation, adjust). Factory: Every column incl. 1000 km (600 mi) initial; no annual check; not a dealer item (p.7-4)
Check steering head bearing adjustment

Front end

Factory

Manual: Steering bearings (check bearing assemblies for looseness). Factory: Marked at 1000, 6000, 12000, 18000 km (not at 24000 km, where repack is marked); no annual check; dealer item (p.7-5)
Front fork (check operation and for oil leakage, replace if necessary)

Front end

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; no annual check; no fork oil change interval printed; dealer item (p.7-5)
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Shock absorber assembly (check operation and for oil leakage, replace if necessary). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; no annual check; dealer item (p.7-5)
Swingarm pivot bushes (check bush assemblies for looseness)

Rear suspension and frame

Factory

Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; no annual check; dealer item (p.7-4)
Check wheel bearings for play

Wheels and tires

Factory

Manual: Wheel bearings (check bearing for looseness or damage). Factory: Marked 6000-24000 km (3500-14000 mi); not at 1000 km initial; no annual check; dealer item (p.7-4)
Wheels (check runout, spoke tightness and for damage, tighten spokes if necessary)

Wheels and tires

Factory

Factory: Every column incl. 1000 km (600 mi) initial; no annual check; dealer item (p.7-4)

Every 5,000 mi or 12 months

1 item

Replace oil filter

Engine

Guideline

Every 6,000 mi or 12 months

4 items

Inspect coolant hoses and clamps

Engine

Guideline
Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

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 7,000 mi

5 items

Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark plug (check condition, adjust gap and clean). Factory: Marked at 6000 and 18000 km (3500/10500 mi); no annual check; dealer item (p.7-3)
Replace spark plugs

Engine

Factory

Manual: Spark plug (replace). Factory: Marked at 12000 and 24000 km (7000/14000 mi); no annual check; dealer item (p.7-3)
Clean / inspect air filter

Fuel and air

Factory

Manual: Air filter element (clean). Factory: Marked at 6000 and 18000 km (3500/10500 mi); no annual check; dealer item. TIP: more frequent service in unusually wet or dusty areas (p.7-4, 7-6)
Replace air filter element

Fuel and air

Factory

Manual: Air filter element (replace). Factory: Marked at 12000 and 24000 km (7000/14000 mi); no annual check; dealer item. TIP: more frequent service in unusually wet or dusty areas (p.7-4, 7-6)
Grease swingarm pivot

Rear suspension and frame

Factory

Manual: Swingarm pivot bushes (lubricate with molybdenum disulfide grease). Factory: Marked at 12000 and 24000 km (7000/14000 mi); no annual check; dealer item (p.7-4)

Every 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 12,000 mi or 2 years

2 items

Synchronize throttle bodies

Fuel and air

Guideline
Clean and grease rear suspension linkage

Rear suspension and frame

Guideline

Every 14,000 mi

1 item

Repack / replace steering head bearings

Front end

Factory

Manual: Steering bearings (moderately repack with lithium-soap-based grease). Factory: Marked at 24000 km (14000 mi) only; with the repeat rule from 30000 km, every 24000 km; dealer item (p.7-5)

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 or 4 years

1 item

Check valve clearances (shim adjusted)

Engine

Guideline

Every 18,000 mi

1 item

Replace chain and sprockets (wear based)

Final drive

Guideline

Every 20,000 mi or 4 years

1 item

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

4 items

Replace coolant

Engine

Guideline
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

Guideline

Every 4 years

2 items

Inspect brake hoses; replace old rubber

Brakes

Guideline
Rebuild calipers and master cylinders (seals)

Brakes

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.