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Kayo · Two-stroke single, premix, chain drive

KT250

Library entry covers 2025

30 factory 52 guideline

Published source

Kayo Motor KT250 User Manual, suggested inspection time table (ManualsLib viewer p.23)

Factory source. Covers Kayo Motor KT250 user manual (English, Zhejiang Kayo Motor; no year printed in the pages read).

82 items for a 2025 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: Two-stroke
Engine lubrication: Two-stroke premix (oil in fuel)
Oil filtration: None (no filter)
Valve gear: None (two-stroke porting)
Ignition: Electronic (CDI / transistor / ECU)
Charging: Alternator / stator with rectifier
Battery: Wet cell (flooded lead-acid, needs topping up)
Fuel system: Single carburetor
Cooling: Liquid cooled
Primary drive: Gear or chain inside engine, shares engine oil
Gearbox oil: Separate gearbox 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

2025 Kayo KT250

On the road: every 200 km

1 item

Check two-stroke oil tank / carry premix oil

Pre-ride / on the road

Guideline

Running a two-stroke out of oil seizes it. Injection bikes: check the tank. Premix: carry oil and a measure.

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 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 3,000 km or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 5,000 km or 12 months

11 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
Clean fuel tap filter / sediment bowl

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 5,000 km or 2 years

1 item

Decarbonize exhaust ports, pipes and baffles

Engine

Guideline

Two-strokes coke up the exhaust port and muffler baffles; power falls off gradually.

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 9,500 km or 12 months

8 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.
Clean carburetor float bowl(s), check float level and jets

Fuel and air

Guideline

Ethanol fuel varnishes old carbs quickly in storage.
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 16,000 km or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change gearbox oil

Primary and gearbox

Guideline

Every 19,500 km or 2 years

3 items

Replace air filter element

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 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 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 10 h

26 items

Antifreeze and coolant level (check)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Final inspection and test run

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Front and rear lights (check)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Gear oil (change)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Rim run-out (check)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Screws and nuts (check tightness)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Air filter and air box (clean)

Fuel and air

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Carburetor idle (check)

Fuel and air

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Fuel filter (replace)

Fuel and air

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Hoses (fuel, cooling, exhaust, drain) and casings: cracks, leaks, routing (inspect)

Fuel and air

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Battery (check and charge)

Ignition and electrics

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Chain tension (check)

Final drive

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Chain, sprockets, guide sleeve and chain guide (check)

Final drive

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Moving parts such as chain and handlebars (lubricate and check smooth operation)

Final drive

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Steering head bearing looseness (check)

Front end

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Frame and swingarm (check)

Rear suspension and frame

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Shock absorber top mount and linkage (check)

Rear suspension and frame

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Brake lines for damage or leakage (check)

Brakes

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Brake pedal and brake lever free play (check)

Brakes

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Front and rear brake fluid levels (check)

Brakes

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Front and rear brake pads and discs (check)

Brakes

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Hub bearings and wheel hubs (check)

Wheels and tires

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Spoke tension (check)

Wheels and tires

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Tire condition and pressure (check)

Wheels and tires

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Cables for damage and sharp bends (check)

Controls and cables

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Throttle cable condition, routing and setting (check)

Controls and cables

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 10 hours or after every race. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.

Every 20 h

2 items

Clutch (check)

Primary and gearbox

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 20 hours. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Swingarm bearing looseness (check)

Rear suspension and frame

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 20 hours. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.

Every 30 h

2 items

Valve clearance (check)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): once after 1 hour, then every 30 hours. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.
Water pump cap seal and shaft seal ring (replace)

Engine

Factory

Factory: Suggested inspection time for all parts of the vehicle (manual p.23, ManualsLib viewer p.23): every 30 hours. Columns as printed: once after 1 hour (one-off), every 10 hours or after every race, every 20 hours, every 30 hours. The table is for reference; adjust the cycle to use.

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

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

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.