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GasGas · Two-stroke single, premix, chain drive

EC 125

Library entry covers 2002-2025

86 factory 36 guideline

Published source

Gas Gas EC / MC / SM 2008 user manual (English section), Maintenance schedule pp.17-18

Factory owner's handbook. Covers 2008 EC (two-stroke) user manual.

122 items for a 2019 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: Magneto (incl. magdyno, flywheel magneto)
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, twin shocks
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2019 GasGas EC 125

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

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 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

On the road: no interval set

1 item

Lubricate drive chain

Pre-ride / on the road

Factory

Factory: Every 1 fill up

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 5,000 km or 12 months

6 items

Clean fuel tap filter / sediment bowl

Fuel and air

Guideline
Check / set ignition timing

Ignition and electrics

Guideline
Clean and gap contact breaker points, oil cam felt

Ignition and electrics

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.
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

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

4 items

Check charging voltage and regulator / cut-out

Ignition and electrics

Guideline
Check swingarm bushes for play

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 9,500 km or 2 years

2 items

Lubricate and check automatic advance unit

Ignition and electrics

Guideline
Magneto: clean slip ring and pickup brush, check HT lead

Ignition and electrics

Guideline

Every 16,000 km or 2 years

1 item

Compression test (or leak-down)

Engine

Guideline

Every 19,500 km or 2 years

2 items

Replace air filter element

Fuel and air

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 19,500 km or 3 years

1 item

Replace points and condenser

Ignition and electrics

Guideline

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

1 item

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 40,000 km or 10 years

1 item

Magneto overhaul / re-magnetize, replace capacitor

Ignition and electrics

Guideline

Weak spark when hot is the classic symptom. Old capacitors fail with age, not miles.

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 12 months

1 item

Change fork oil

Front end

Factory

Manual: Front fork oil. Factory: Change every year

Every 2 years

5 items

Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Rear shock absorber oil. Factory: Every 2 years
Rebuild calipers and master cylinders (seals)

Brakes

Factory

Manual: Brake pump piston & dust cover / caliper piston seal & dust seal. Factory: Change every 2 years
Replace brake fluid

Brakes

Factory

Manual: Brake fluid. Factory: Change every 2 years

Every 4 years

1 item

Inspect brake hoses; replace old rubber

Brakes

Factory

Manual: Brake hose and pipe. Factory: Change every 4 years

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

80 items

Coolant - Adjust

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Coolant - Change / Replace

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Cylinder head, cyl. & exhaust valves - Adjust

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Cylinder head, cyl. & exhaust valves - Change / Replace

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Cylinder head, cyl. & exhaust valves - Check / Inspect

Engine

Factory

Factory: As printed: 3 fill ups
Discs - Adjust

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Discs - Change / Replace

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Engine bearings - Adjust

Engine

Factory

Factory: As printed: 10 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Engine bearings - Change / Replace

Engine

Factory

Factory: As printed: 10 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Engine bearings - Check / Inspect

Engine

Factory

Factory: As printed: 10 fill ups
Exhaust - Adjust

Engine

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Exhaust - Change / Replace

Engine

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Exhaust - Check / Inspect

Engine

Factory

Factory: As printed: 1 fill up
Exhaust - Clean

Engine

Factory

Factory: As printed: 1 fill up
Exhaust pipe o'ring - Change / Replace

Engine

Factory

Factory: As printed: 3 fill ups
General lubrication - Apply grease / Lubricate

Engine

Factory

Factory: As printed: 5 fill ups
General lubrication - Check / Inspect

Engine

Factory

Factory: As printed: 5 fill ups
Inspect coolant hoses and clamps

Engine

Factory

Manual: Radiator tube and connections. Factory: Check every 1 fill up
Kick-start pedal and gearshift pedal - Apply grease / Lubricate

Engine

Factory

Factory: As printed: 1 fill up
Muffler gasket

Engine

Factory

Factory: Change every 10 fill ups
Muffler gasket - Adjust

Engine

Factory

Factory: As printed: 10 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Nuts, bolt, fasteners - Adjust

Engine

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Nuts, bolt, fasteners - Change / Replace

Engine

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Nuts, bolt, fasteners - Check / Inspect

Engine

Factory

Factory: As printed: 5 fill ups
Piston and piston ring

Engine

Factory

Factory: Check, clean every 3 fill ups; replace if necessary
Piston and piston ring - Adjust

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Piston and piston ring - Change / Replace

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Piston bearing

Engine

Factory

Factory: Check every 3 fill ups, change every 10 fill ups
Piston bearing - Adjust

Engine

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Radiator tube and connections - Adjust

Engine

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Radiator tube and connections - Change / Replace

Engine

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Rear sprocket - Adjust

Engine

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Rear sprocket - Change / Replace

Engine

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Replace coolant

Engine

Factory

Manual: Coolant. Factory: Check every 3 fill ups; change if necessary
Replace spark plugs (two-stroke)

Engine

Factory

Manual: Spark plug. Factory: Clean every 1 fill up
Air cleaner element - Change / Replace

Fuel and air

Factory

Factory: As printed: When damaged
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle cable. Factory: Adjust every 1 fill up
Clean / inspect air filter

Fuel and air

Factory

Manual: Air cleaner element. Factory: Clean every 1 fill up; replace when damaged
Clean carburetor float bowl(s), check float level and jets

Fuel and air

Factory

Manual: Carburetor. Factory: Check and adjust every 1 fill up
Fuel hose - Adjust

Fuel and air

Factory

Factory: As printed: 7 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Fuel system - Change / Replace

Fuel and air

Factory

Factory: As printed: 10 fill ups
Fuel system - Clean

Fuel and air

Factory

Factory: As printed: When necessary
Replace fuel lines

Fuel and air

Factory

Manual: Fuel hose. Factory: Check and change every 7 fill ups
Change gearbox oil

Primary and gearbox

Factory

Manual: Transmission oil. Factory: Change every 3 fill ups (tankfuls)
Clutch - Adjust

Primary and gearbox

Factory

Factory: As printed: At each fill up
Clutch - Apply grease / Lubricate

Primary and gearbox

Factory

Factory: As printed: At each fill up
Clutch - Change / Replace

Primary and gearbox

Factory

Factory: As printed: At each fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Clutch - Check / Inspect

Primary and gearbox

Factory

Factory: As printed: At each fill up
Inspect clutch plates and springs

Primary and gearbox

Factory

Manual: Clutch discs. Factory: Check every 3 fill ups; clutch checked at each fill up
Chain slider - Adjust

Final drive

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Chain slider - Change / Replace

Final drive

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Chain slider - Check / Inspect

Final drive

Factory

Factory: As printed: 5 fill ups
Drive chain - Check / Inspect

Final drive

Factory

Factory: As printed: 1 fill up
Inspect chain and sprockets for wear (measure stretch)

Final drive

Factory

Manual: Drive chain wear / rear sprocket. Factory: Adjust/replace every 5 fill ups
Check steering head bearing adjustment

Front end

Factory

Manual: Steering play. Factory: Check every 1 fill up
Front fork - Adjust

Front end

Factory

Factory: As printed: When necessary
Front fork - Change / Replace

Front end

Factory

Factory: As printed: When damaged
Front fork - Clean

Front end

Factory

Factory: As printed: When necessary
Inspect fork seals, stanchions and fork boots

Front end

Factory

Manual: Front fork. Factory: Check every 1 fill up
Repack / replace steering head bearings

Front end

Factory

Manual: Steering bearing. Factory: Lubricate every 10 fill ups
Clean and grease rear suspension linkage

Rear suspension and frame

Factory

Manual: Swingarm and linkages. Factory: Check and lubricate every 5 fill ups
Rear shock absorber oil - Adjust

Rear suspension and frame

Factory

Factory: As printed: 2 years* ((*) Inspect and carry out these operations only if it is necessary.)
Rear shock absorber oil - Change / Replace

Rear suspension and frame

Factory

Factory: As printed: 2 years* ((*) Inspect and carry out these operations only if it is necessary.)
Swingarm and linkages - Adjust

Rear suspension and frame

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Swingarm and linkages - Change / Replace

Rear suspension and frame

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake adjustment - Adjust

Brakes

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake adjustment - Change / Replace

Brakes

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake adjustment - Check / Inspect

Brakes

Factory

Factory: As printed: 3 fill ups
Brake fluid level - Adjust

Brakes

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake fluid level - Change / Replace

Brakes

Factory

Factory: As printed: 3 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake fluid level - Check / Inspect

Brakes

Factory

Factory: As printed: 3 fill ups
Brake pads wear - Adjust

Brakes

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Brake pads wear - Change / Replace

Brakes

Factory

Factory: As printed: 5 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Check brake pads and discs

Brakes

Factory

Manual: Brake pads wear. Factory: Check every 5 fill ups
Check spoke tension and wheel true

Wheels and tires

Factory

Manual: Spoke tightness and rim runout. Factory: Check every 1 fill up
Check wheel bearings for play

Wheels and tires

Factory

Manual: Wheel bearing. Factory: Check every 10 fill ups
Spoke tightness and rim runout - Adjust

Wheels and tires

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Spoke tightness and rim runout - Change / Replace

Wheels and tires

Factory

Factory: As printed: 1 fill up* ((*) Inspect and carry out these operations only if it is necessary.)
Wheel bearing - Adjust

Wheels and tires

Factory

Factory: As printed: 10 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)
Wheel bearing - Change / Replace

Wheels and tires

Factory

Factory: As printed: 10 fill ups* ((*) Inspect and carry out these operations only if it is necessary.)

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.