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Sherco · Two-stroke single, premix, chain drive

125 SM Factory

Library entry covers 2024

33 factory 52 guideline

Published source

Sherco 125 SE / SM 2T owner's manual (English section), Specification 125 SM Factory pp.144-145 and Maintenance Schedule 125 SM p.146 (official sherco.com PDF)

Factory owner's handbook. Covers Sherco owner's manual for the 125 SE / 125 SM two-stroke (file named 2024; no year printed on the pages read); other model years not covered.

85 items for a 2024 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

2024 Sherco 125 SM Factory

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 10 h or 500 km or 12 months

18 items

Change engine oil

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check / Adjust coolant fluid level

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check discs thickness and screws tightness

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check general tightness of bolts and screws

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check rims and hubs

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check the chassis

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Clean air filter and box

Fuel and air

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check battery

Ignition and electrics

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check chain tension

Final drive

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check / Adjust steering head bearings

Front end

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check the swingarm

Rear suspension and frame

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check / Adjust brake fluid level

Brakes

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check status and sealing of the brake/clutch lines

Brakes

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check status of the foot brake pedal and hand brake lever

Brakes

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check condition and tire pressure

Wheels and tires

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check general bearings clearance (swingarm, links, wheels)

Wheels and tires

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check spoke tension

Wheels and tires

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.
Check status, flexibility and position of the cables, adjust and lubricate

Controls and cables

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 10 using hours / every 500 km; every 20 using hours / every 1000 km; every 30 using hours / every 1500 km; every 40 using hours / every 2000 km; every 50 using hours / every 2500 km; every 100 using hours / every 5000 km; after each race; every year.

Every 20 h or 1,000 km or 12 months

1 item

Grease direction (steering) bearings

Front end

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 20 using hours / every 1000 km; every 40 using hours / every 2000 km; every 100 using hours / every 5000 km; every year.

Every 20 h or 1,000 km

1 item

Replace exhaust rockwool

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 20 using hours / every 1000 km; every 40 using hours / every 2000 km.

Every 30 h or 1,500 km or 12 months

5 items

Change spark plug

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 30 using hours / every 1500 km; every year.
Grease links bearings

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 30 using hours / every 1500 km; every 100 using hours / every 5000 km; after each race; every year.
Fork maintenance

Front end

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 30 using hours / every 1500 km; every year.
Shock absorber maintenance

Rear suspension and frame

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 30 using hours / every 1500 km; every year.
Check brake pad thickness

Brakes

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked after 1 using hour; every 30 using hours / every 1500 km; every 50 using hours / every 2500 km; after each race; every year.

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 40 h or 2,000 km

2 items

Replace the piston

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 40 using hours / every 2000 km; every 100 using hours / every 5000 km.
Check the clutch disc wear

Primary and gearbox

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 40 using hours / every 2000 km; after each race.

Every 50 h or 2,500 km

3 items

Check the wear of the cylinder and piston

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 50 using hours / every 2500 km; every 100 using hours / every 5000 km.
Check / replace the gearbox (gears, shift forks)

Front end

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 50 using hours / every 2500 km; every 100 using hours / every 5000 km.
Control cylinder head

Controls and cables

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 50 using hours / every 2500 km; every 100 using hours / every 5000 km.

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 100 h or 5,000 km

3 items

Replace all O-rings of the engine

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 100 using hours / every 5000 km.
Replace all bearings of the central carters

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 100 using hours / every 5000 km.
Replace the connecting rod

Engine

Factory

Factory: Maintenance schedule 125 SM (printed p.146): marked every 100 using hours / every 5000 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 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 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.