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

Halcyon 250

Library entry covers 2020-2023

35 factory 45 guideline

Published source

Janus 250 Series Owner's Handbook (edited Jan 1st, 2021), Periodic Maintenance Schedule printed p.47

Factory source. Covers Janus 250 Series Owner's Handbook, edited Jan 1st, 2021 (names the Phoenix 250, Halcyon 250 and Gryffin 250); other editions not compared.

80 items for a 2023 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: Single carburetor
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: Rigid (hardtail)
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2023 Janus Halcyon 250

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 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 402 km

1 item

Drive chain (check and lubricate)

Final drive

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 250 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.

Every 805 km

1 item

Drive chain tension (check and adjust)

Final drive

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 1,600 km or 12 months

1 item

Grease saddle pivot, check saddle springs / seat post

Rear suspension and frame

Guideline

Every 3,219 km

4 items

Engine oil (change)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2,000 miles; first at 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Engine oil filter (clean)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2,000 miles; first at 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Valve clearance (check and adjust)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2,000 miles; first at 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Air filter (clean)

Fuel and air

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2,000 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.

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 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 9,500 km or 12 months

5 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.
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
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 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

1 item

Replace air filter element

Fuel and air

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 48,500 km or 6 years

1 item

Rebuild forks: seals, bushes, springs

Front end

Guideline

Every 1 month

15 items

Engine oil level (check)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Engine stop switch (check)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Fasteners (check for security)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Lights, instruments and electrical (check)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Battery (charge)

Ignition and electrics

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Drive chain wear (check)

Final drive

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Fork linkage fastener tension (check)

Front end

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Steering free movement (check)

Front end

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Rear swingarm pivot fastener tension (check)

Rear suspension and frame

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Shock absorbers damping and stroke (check)

Rear suspension and frame

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Side stand operation (check)

Rear suspension and frame

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Brake fluid level (check)

Brakes

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Tire pressure (check and adjust)

Wheels and tires

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Tire tread depth and damage (check)

Wheels and tires

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Wheels and spokes (check for damage, broken or loose spokes)

Wheels and tires

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every month. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 12 months

12 items

Headset bearings (check and adjust)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Idle speed (check)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Spark plug (check)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Throttle play, return and drag (check and adjust)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Fuel system (check for leaks and wear)

Fuel and air

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Clutch play and engagement (check and adjust)

Primary and gearbox

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Drive chain friction plate (check)

Final drive

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at 2,000, 4,000 and 6,000 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Fork linkage (lubricate)

Front end

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Brake fluid (change)

Brakes

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; marked at 2,000, 4,000 and 6,000 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Brake master cylinders and calipers (check for leaks, seized pistons)

Brakes

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; at delivery and every column. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Brake pads (check wear)

Brakes

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Wheel bearings (check wear and play)

Wheels and tires

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every year; from 500 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.

Every 2 years

5 items

Spark plug (change)

Engine

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2 years; marked at 2,000, 4,000 and 6,000 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
Air filter (change)

Fuel and air

Factory

Factory: Periodic Maintenance Schedule (printed p.47): every 2 years; marked at 2,000, 4,000 and 6,000 miles. Columns as printed: at delivery, 500, 1,000, 2,000, 4,000 and 6,000 miles, with an EVERY column; whichever comes first.
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.

Keep up with this schedule on your phone

Add the bike in the app and this chart loads itself, ready to log against and edit.

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Other 2023 Janus models

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