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Sherco · Two-stroke single, premix, chain drive

250 SE-R

Library entry covers 2020

63 factory 52 guideline

Published source

Sherco 250-300 SE/R owner's manual, maintenance schedule pp.132-134 English (sherco.com)

Factory owner's handbook. Covers Sherco 250-300 SE/R owner's manual (official sherco.com PDF; schedule pages print 250-300 SE/R); no model year printed on the pages read.

115 items for a 2020 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, hydraulic
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

2020 Sherco 250 SE-R

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

1 item

Inspect, clean and gap spark plugs

Engine

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

2 items

Muffler fiberglass packing (replace)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 10, 20, 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Valves and boosters working (check)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 10, 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.

Every 20 h

25 items

Bolts and screws general tightness (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Cooling system leaks (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Electric components function (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Electrical wiring status and position (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Exhaust sealing and attachment (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Gear box oil (change)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Valves and booster system (check)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Air filter and housing (clean)

Fuel and air

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Carburetor (clean, empty float chamber)

Fuel and air

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Clutch disc wear (check)

Primary and gearbox

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 20, 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Clutch master cylinder oil level (check)

Primary and gearbox

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Clutch springs length (check)

Primary and gearbox

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 20, 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Chain (lubricate)

Final drive

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Chain, sprockets, guides and chain tension (check)

Final drive

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Fork and shock leaks and function (check)

Front end

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Fork dust covers (clean)

Front end

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Fork legs (purge air)

Front end

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Steering head bearings (check and adjust)

Front end

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Brake fluid level, pad thickness and discs (check)

Brakes

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Brake system fasteners and discs tightness (check)

Brakes

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Foot brake pedal and hand brake lever (check)

Brakes

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Rims and spoke tension (check)

Wheels and tires

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Every 20 h.
Tires condition and pressure (check)

Wheels and tires

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Wheel bearing clearance (check)

Wheels and tires

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.
Cables: status, flexibility and position (check, adjust, lubricate)

Controls and cables

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h and every 20 h.

Every 40 h

9 items

Big end bearing (replace)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Connecting rod condition (check)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Crankshaft bearings (replace)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Crankshaft end run-out (check)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Cylinder and piston wear (check)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Reed valve petals (check)

Engine

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Clutch housing (check not loose)

Primary and gearbox

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Clutch nut (check not loose)

Primary and gearbox

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.
Gearbox components wear (check)

Primary and gearbox

Factory

Factory: Maintenance schedule continued, dealer items (printed p.134): competition use at 10, 20, 40 and 80 h; recreational use printed as at 20, 40 and 80 h. Marks: competition 40 and 80 h columns. In competition, perform the 20 hour maintenance after each race.

Every 50 h

1 item

Spark plug (replace)

Engine

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. Replace spark plug after 50 hours.

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 12 months

7 items

Muffler fiberglass (replace)

Engine

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Electric contacts and switches (treat with aerosol protector)

Ignition and electrics

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Clutch hydraulic fluid (replace)

Primary and gearbox

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Fork (dealer service)

Front end

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Steering head bearings and seals (clean and grease)

Front end

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Shock (dealer service)

Rear suspension and frame

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.
Brake fluid (replace)

Brakes

Factory

Factory: Annual maintenance by the dealer (printed p.133): at least once a year. Once a year.

Every 2 years

5 items

Replace coolant

Engine

Guideline
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Replace hydraulic clutch fluid

Primary and gearbox

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

No interval set

19 items

Anti-corrosion protector on unpainted parts (spray)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.
Coolant level (check)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Electrical switches protector (spray)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.
Engine oil level (check)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Horn operation (check)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Lights operation (check)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Nuts, screws and clamps tightness (check)

Engine

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.
Air filter and box (clean)

Fuel and air

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.
Fuel lines leaks (check)

Fuel and air

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Chain (clean, lubricate, check and adjust tension)

Final drive

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.
Fork dust seals (clean)

Front end

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use, regularly.
Fork legs (purge air)

Front end

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use, regularly.
Brake fluid level (check)

Brakes

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Brake lines status and sealing (check)

Brakes

Factory

Factory: Maintenance schedule (printed p.132, 250-300 SE/R, English): columns after 5 hours and every 20 hours. After 5 h.
Brake pads status (check)

Brakes

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Brakes (check)

Brakes

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before and after each use.
Tires and tire pressure (check)

Wheels and tires

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
All controls status (check)

Controls and cables

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. Before each use.
Throttle cable (lubricate)

Controls and cables

Factory

Factory: Checks by the rider (printed p.133): before each use / after each use. After each use.

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.