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

WR 155

Library entry covers 2020-2022

41 factory 52 guideline

Published source

Yamaha WR155 owner's manual B3M-F8199-EZ (1st edition February 2020), periodic maintenance charts pp.7-2 to 7-6 (yamaha-motor.co.th)

Factory source. Covers Yamaha WR155 owner's manual, 1st edition February 2020 (cover prints WR155).

93 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: 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 WR 155

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

Guideline

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

On the road: every 800 km

1 item

Check coolant level

Pre-ride / on the road

Guideline

On the road: every 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 1,000 km

1 item

Drive chain slack, alignment, condition (check, adjust, lubricate)

Final drive

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 1,000 km and after washing, riding in the rain or in wet areas.

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 3,000 km or 3 months

30 items

Chassis fasteners (check tight)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Cooling system level and leaks (check)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Diagnostic system check (Yamaha diagnostic tool, error codes)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Engine oil (change, check level and leaks)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Exhaust system leaks, tightness and gaskets (check)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Lights, signals and switches (check), headlight beam (adjust)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Rear suspension relay arm and connecting arm pivots (check)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km.
Spark plug (check, clean, regap)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km.
Throttle grip free play and housing (check, adjust, lubricate)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Air filter check hose (clean)

Fuel and air

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months.
Fuel hoses (check for cracks or damage)

Fuel and air

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Fuel injection idle speed (adjust)

Fuel and air

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Battery voltage (check, charge if necessary)

Ignition and electrics

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Clutch lever pivot (lubricate)

Primary and gearbox

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Clutch operation (check, adjust)

Primary and gearbox

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months.
Primary air filter element (clean)

Primary and gearbox

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check. More often in wet or dusty areas.
Front fork operation and oil leaks (check)

Front end

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km.
Steering bearings play and roughness (check)

Front end

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months.
Shock absorber assembly (check)

Rear suspension and frame

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km.
Sidestand (check, lubricate)

Rear suspension and frame

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Brake hoses (check cracks, routing and clamping)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Brake pedal pivot (lubricate)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Front and rear brake switches (check)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check.
Front brake lever pivot (lubricate, silicone grease)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Front brake operation, fluid level and leaks (check)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check. Replace pads whenever worn to the limit.
Rear brake operation, fluid level and leaks (check)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months, and at the annual check. Replace pads whenever worn to the limit.
Tires tread, damage and air pressure (check)

Wheels and tires

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.
Wheel bearings looseness or damage (check)

Wheels and tires

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km.
Wheels runout, spoke tightness and damage (check)

Wheels and tires

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000 km, then every 3,000 km or 3 months.
Moving parts and cables (lubricate)

Controls and cables

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3,000 km or 3 months from 4,000 km, and at the annual check.

Every 5,000 km or 12 months

10 items

Check throttle cable(s) free play and return

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 steering head bearing adjustment

Front end

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 brake pads and discs

Brakes

Guideline
Check spoke tension and wheel true

Wheels and tires

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 6,000 km

2 items

Engine oil filter element (replace)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 1,000, 7,000 and 13,000 km.
Rear suspension relay arm and connecting arm pivots (lubricate)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. At 7,000 and 13,000 km.

Every 6,500 km or 12 months

2 items

Inspect, clean and gap spark plugs

Engine

Guideline
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline

Every 8,000 km or 12 months

2 items

Change engine oil

Engine

Guideline

Pre-1970 machines: many owners run non-detergent or classic-spec oil with no filter, so short intervals matter. Dry sump: drain the tank and the crankcase/sump, flush the tank and clean the feed and return screens.
Replace oil filter

Engine

Guideline

Every 8,000 km

1 item

Spark plug (replace)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 8,000 km.

Every 9,500 km or 12 months

7 items

Inspect coolant hoses and clamps

Engine

Guideline
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 10,000 km

1 item

Valve clearance (check, adjust)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 10,000 km.

Every 12,000 km

2 items

Fuel filter (check, replace if necessary)

Fuel and air

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 12,000 km.
Steering bearings (lubricate, lithium-soap grease)

Front end

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 12,000 km.

Every 13,000 km or 2 years

1 item

Check and adjust valve clearances

Engine

Guideline

Every 16,000 km or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 19,500 km 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 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 24,000 km

1 item

Secondary air filter element (replace)

Fuel and air

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 24,000 km.

Every 25,500 km or 4 years

1 item

Replace spark plugs

Engine

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 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

5 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
Brake fluid (change)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 2 years.
Replace brake fluid

Brakes

Guideline

Every 3 years

1 item

Coolant (change)

Engine

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 3 years.

Every 4 years

4 items

Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Brake hoses (replace)

Brakes

Factory

Factory: Periodic maintenance charts (Yamaha WR155 owner's manual B3M-F8199-EZ, 1st edition February 2020, pp.7-2 to 7-6; columns 1,000 km/1 month, 4,000 km/4 months, 7,000 km/7 months, 10,000 km/10 months, 13,000 km/13 months and annual check; from 16,000 km repeat the intervals starting from 4,000 km). Items marked * are for a Yamaha dealer. Every 4 years.
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.