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Aprilia · Two-stroke single, premix, chain drive

SX 125

Library entry covers 2008-2025

47 factory 49 guideline

Published source

Aprilia RX SX 125 service station manual, routine maintenance table MAIN-25 (ManualsLib viewer p.25)

Factory service manual. Covers Aprilia RX/SX 125 service station manual, two-stroke model with oil mixer and RAVE valve; no year printed; the later four-stroke SX 125 is not covered.

96 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: 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: Air / oil 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

2023 Aprilia SX 125

On the road: every 150 mi

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 300 mi

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 600 mi

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 311 mi

1 item

Drive chain (lubricate)

Final drive

Factory

Factory: Routine maintenance table (MAIN-25): lubricate the chain every 500 km (310.98 mi). Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 1,000 mi or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 2,000 mi or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 2,485 mi

31 items

Bolts and nuts (tighten)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Braking systems (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Coolant (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Cooling system (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Exhaust outlet valve, full power (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Front headlight aiming (adjust)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): A at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Light circuit (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Mixer oil pipes (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column from 4,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Mixer oil reserve warning light (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Muffler and muffler (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column from 4,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Spark plug (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at 1,000, 4,000 km and the 4,000 km steps between replacements. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Two-stroke mixer oil level (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Vehicle general operation (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Air filter (inspect)

Fuel and air

Factory

Factory: Routine maintenance table (MAIN-25): I at 1,000, 4,000 km and the 4,000 km steps between replacements. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Carburetor idle speed (adjust)

Fuel and air

Factory

Factory: Routine maintenance table (MAIN-25): A at 1,000 km and every 8,000 km; I at the other columns. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Fuel pipes (inspect)

Fuel and air

Factory

Factory: Routine maintenance table (MAIN-25): I at every column from 4,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Battery and terminal tightening (inspect)

Ignition and electrics

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Clutch clearance (adjust)

Primary and gearbox

Factory

Factory: Routine maintenance table (MAIN-25): A at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Clutch wear (inspect)

Primary and gearbox

Factory

Factory: Routine maintenance table (MAIN-25): I at every column from 4,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Gearbox oil (inspect)

Primary and gearbox

Factory

Factory: Routine maintenance table (MAIN-25): I at the columns between replacements. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Transmission cables and controls (inspect)

Primary and gearbox

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Final drive: chain, sprocket, pinion (inspect)

Final drive

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Steering bearings and clearance (inspect)

Front end

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Brake discs (inspect)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Brake fluid (inspect)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Brake pad wear (inspect)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): I at every column (no mark printed at 28,000 km). Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Brake system pipes (inspect)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): I at every column from 4,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Wheel bearings (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Wheel centering (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Wheels and tires (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Kick-start lever bolt (inspect)

Controls and cables

Factory

Factory: Routine maintenance table (MAIN-25): I at every column. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 3,000 mi 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 3,000 mi 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 4,000 mi 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 4,971 mi

6 items

Mixer pump and air bleeding (adjust)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at 1,000 km; A at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Spark plug (replace)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): R at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Two-stroke oil mixer filter (clean)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): C at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Air filter (replace)

Fuel and air

Factory

Factory: Routine maintenance table (MAIN-25): R at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Rear shock absorber (inspect)

Rear suspension and frame

Factory

Factory: Routine maintenance table (MAIN-25): I at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
RAVE (full power) control unit (adjust)

Controls and cables

Factory

Factory: Routine maintenance table (MAIN-25): I at 1,000 km; A at 8,000 km and every 8,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 6,000 mi or 12 months

7 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
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 7,456 mi

1 item

Gearbox oil (replace)

Primary and gearbox

Factory

Factory: Routine maintenance table (MAIN-25): R at 1,000, 12,000, 24,000 and 36,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 9,942 mi

2 items

Piston and compression rings (inspect)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): I at 8,000, 24,000 and 40,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Piston and compression rings (replace)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): R at 16,000 and 32,000 km. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 10,000 mi or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
Change gearbox oil

Primary and gearbox

Guideline

Every 12,000 mi 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 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 16,000 mi or 4 years

1 item

Replace spark plugs

Engine

Guideline

Every 18,000 mi

1 item

Replace chain and sprockets (wear based)

Final drive

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 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 12 months

1 item

Brake fluid (replace)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): replace every year. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.

Every 2 years

5 items

Coolant (replace)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): replace every 2 years. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Fork oil and oil seal (replace)

Front end

Factory

Factory: Routine maintenance table (MAIN-25): replace every 2 years (no km marks printed). Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Replace brake fluid

Brakes

Guideline

Every 4 years

6 items

Mixer oil pipes (replace)

Engine

Factory

Factory: Routine maintenance table (MAIN-25): replace every 4 years. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Fuel pipes (replace)

Fuel and air

Factory

Factory: Routine maintenance table (MAIN-25): replace every 4 years. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Brake system pipes (replace)

Brakes

Factory

Factory: Routine maintenance table (MAIN-25): replace every 4 years. Columns: 1,000 km, then every 4,000 km to 40,000 km. Codes: I = inspect and clean, adjust, lubricate or replace if necessary; C = clean; R = replace; A = adjust; L = lubricate.
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.