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Hyosung · Shim-adjusted overhead-cam four-stroke single, wet sump, gearbox shares engine oil, CVT belt drive

MS3 250

Library entry covers 2006-2014

25 factory 32 guideline

Published source

Hyosung MS3 (125/250) Owner's Manual, 2007 edition, Periodic Maintenance p.57 (factory PDF, copy on archive.org)

Factory owner's handbook. Covers MS3 125 and 250 scooter, manual 2007.

Open the source

57 items for a 2007 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: Automatic or semi-automatic
Final drive: Belt CVT, scooter automatic
Front suspension: Telescopic fork
Rear suspension: Swingarm, single shock / cantilever
Front brake: Disc, hydraulic
Rear brake: Drum (or band / belt rim)
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2007 Hyosung MS3 250

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

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 500 mi

1 item

Check coolant level

Pre-ride / on the road

Guideline

Every 1,000 mi or 6 months

1 item

Adjust rear drum brake and rod / cable linkage

Brakes

Guideline

Every 1,864 mi

1 item

Clean / inspect air filter

Fuel and air

Factory

Manual: Air cleaner element. Factory: Clean every 3,000 km (printed across columns).

Every 2,485 mi or 2 years

1 item

Replace brake fluid

Brakes

Factory

Manual: Brake fluid. Factory: Inspect every 4,000 km; replace every 2 years.

Every 2,485 mi or 4 years

3 items

Inspect coolant hoses and clamps

Engine

Factory

Manual: Radiator hose. Factory: Inspect every 4,000 km (not at 1,000); replace every 4 years.
Replace fuel lines

Fuel and air

Factory

Manual: Fuel hose. Factory: Inspect every 4,000 km; replace every 4 years.
Inspect brake hoses; replace old rubber

Brakes

Factory

Manual: Brake hose. Factory: Inspect every 4,000 km; replace every 4 years.

Every 2,485 mi

15 items

Change engine oil

Engine

Factory

Manual: Engine oil. Factory: Replace at 1,000 km then every 4,000 km.
Chassis nuts and bolts

Engine

Factory

Factory: Tighten.
Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance adjust. Factory: Inspect at 1,000 km then every 4,000 km. Cols: First 1,000 / Every 4,000 / Every 8,000 km.
Check cylinder head bolt torque

Engine

Factory

Manual: Cylinder head bolt. Factory: Tighten at 1,000 km then every 4,000 km.
Exhaust pipe bolts and muffler mounting bolts

Engine

Factory

Factory: Tighten at 1,000 km then every 4,000 km.
Idle speed

Engine

Factory

Factory: Inspect.
Inspect, clean and gap spark plugs

Engine

Factory

Manual: Spark plug. Factory: Clean/inspect at 1,000 km then every 4,000 km.
Replace oil filter

Engine

Factory

Manual: Engine oil filter. Factory: Replace at 1,000 km then every 4,000 km.
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle cable. Factory: Inspect.
Check steering head bearing adjustment

Front end

Factory

Manual: Steering. Factory: Inspect.
Inspect fork seals, stanchions and fork boots

Front end

Factory

Manual: Front forks. Factory: Inspect; not at 1,000 km.
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Rear shock absorber. Factory: Inspect; not at 1,000 km.
Check brake pads and discs

Brakes

Factory

Manual: Brake. Factory: Inspect.
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Tire. Factory: Inspect.
Lubricate control cables and lever pivots

Controls and cables

Factory

Manual: General lubrication. Factory: Lubricate; points: lever holders, stand, pedal, cables.

Every 3,000 mi or 12 months

4 items

Adjust automatic / semi-automatic clutch

Primary and gearbox

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 wheel bearings for play

Wheels and tires

Guideline

Every 4,000 mi or 12 months

2 items

Inspect CVT drive belt, rollers / sliders and clutch shoes

Final drive

Guideline

Typical scooter interval. Your owner's manual figure governs; check belt width against the service limit.
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 4,971 mi

3 items

Replace spark plugs

Engine

Factory

Manual: Spark plug. Factory: Replace in Every 8,000 km column.
Check gearbox oil level

Primary and gearbox

Factory

Manual: Transmission oil. Factory: Inspect at 1,000 km and in Every 8,000 km column.
Inspect drive belt, pulleys and tension

Final drive

Factory

Manual: Drive belt. Factory: Inspect, Every 8,000 km column only.

Every 6,000 mi or 12 months

3 items

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 7,456 mi

1 item

Replace air filter element

Fuel and air

Factory

Manual: Air cleaner element. Factory: Replace every 12,000 km.

Every 10,000 mi or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 12,000 mi or 2 years

3 items

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 12,000 mi or 3 years

1 item

Replace CVT drive belt

Final drive

Guideline

Typical scooter interval, or sooner if the belt is cracked, glazed or below its width limit.

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 15,000 mi

1 item

Replace brake linings / skim drums (wear based)

Brakes

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

3 items

Replace coolant

Engine

Factory

Manual: Engine coolant. Factory: Replace every 2 years.
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline

Every 4 years

1 item

Rebuild calipers and master cylinders (seals)

Brakes

Guideline

Every 6 years

1 item

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.