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Aprilia · Two-stroke single, premix, chain drive

RX 125

Library entry covers 1984-2025

46 factory 62 guideline

Published source

Aprilia SX-RX 125 use and maintenance book (Ed. 03 2008), ManualsLib

Factory owner's handbook. Covers edition Ed. 03 2008 (SX-RX 125).

108 items for a 1998 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: Drum (or band / belt rim)
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

1998 Aprilia RX 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

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 500 km

1 item

Drive chain (lubricate)

Final drive

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 500 km (310.98 mi).

Every 1,600 km or 1 month

1 item

Check battery electrolyte, top up with distilled water

Ignition and electrics

Guideline

Wet-cell batteries on old machines need regular topping up, more in hot weather.

Every 1,600 km or 6 months

2 items

Adjust rear drum brake and rod / cable linkage

Brakes

Guideline
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 4,000 km

29 items

Bolts and nuts tightening (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Braking system pipes (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4000 km.
Braking systems (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Coolant (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Cooling system (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Exhaust muffler/muffler (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4000 km.
Exhaust valve (inspect, full power version)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Front headlight direction (adjust)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Light circuit (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Low mixer oil warning light (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Mixer oil level (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Mixer oil pipes (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4000 km.
Pad wear (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Spark plug (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 and 4000 km and the 4000 km services between replacements.
Vehicle general operation (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Air filter (inspect)

Fuel and air

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 and 4000 km and the 4000 km services between replacements.
Fuel pipes (inspect)

Fuel and air

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4000 km.
Battery and terminal tightening (inspect)

Ignition and electrics

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Clutch clearance (adjust)

Primary and gearbox

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Clutch wear (inspect)

Primary and gearbox

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4000 km.
Transmission cables and controls (inspect)

Primary and gearbox

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Final drive unit: chain, crown, pinion (inspect)

Final drive

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Steering bearings and steering clearance (inspect)

Front end

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Brake discs (inspect)

Brakes

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Brake fluid (inspect)

Brakes

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Wheel bearings (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Wheel centring (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Wheels and tires (inspect)

Wheels and tires

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.
Start-up lever bolt (inspect)

Controls and cables

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 4000 km.

Every 5,000 km or 12 months

14 items

Check throttle cable(s) free play and return

Fuel and air

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 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.
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

3 items

Inspect, clean and gap spark plugs

Engine

Guideline
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 8,000 km

8 items

Mixer and air purging pump (adjust)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Inspect at 1000 km; adjust every 8000 km.
Mixer oil filter (clean)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 8000 km.
Pistons and compression rings (inspect)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 8000, 24000 and 40000 km.
Spark plug (replace)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 8000 km.
Air filter (replace)

Fuel and air

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 8000 km.
Carburetor idle speed (adjust)

Fuel and air

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km and every 8000 km; inspect at the 4000 km services between.
Rear shock absorber (inspect)

Rear suspension and frame

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 8000 km.
RAVE control unit (adjust, full power version)

Controls and cables

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Inspect at 1000 km; adjust every 8000 km.

Every 9,500 km or 12 months

7 items

Inspect coolant hoses and clamps

Engine

Guideline
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 9,500 km or 2 years

3 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
Change gearbox oil

Primary and gearbox

Guideline

Every 12,000 km

1 item

Gearbox oil (replace)

Primary and gearbox

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 1000 km, then every 12000 km; inspect at the other 4000 km services.

Every 13,000 km or 2 years

1 item

Replace spark plugs

Engine

Guideline

Every 16,000 km or 2 years

2 items

Compression test (or leak-down)

Engine

Guideline
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 km

1 item

Pistons and compression rings (replace)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. At 16000 and 32000 km.

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 24,000 km

1 item

Replace brake linings / skim drums (wear based)

Brakes

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 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

2 items

Brake fluid (replace)

Brakes

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every year.
Check speedometer / odometer against a known distance

Controls and cables

Guideline

Old speedos drift with tire size and drive wear. Use phone GPS over a measured 10 miles / km.

Every 2 years

6 items

Coolant (replace)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 2 years.
Replace coolant

Engine

Guideline
Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Fork oil and oil seal (replace)

Front end

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 2 years.
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Replace brake fluid

Brakes

Guideline

Every 4 years

6 items

Braking system pipes (replace)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4 years.
Mixer oil pipes (replace)

Engine

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4 years.
Fuel pipes (replace)

Fuel and air

Factory

Factory: Routine maintenance table (Aprilia SX-RX 125 use and maintenance book, Ed. 03 2008, printed p.135-137). Columns: 1000 km, then every 4000 km to 40000 km. Key: I inspect and clean, adjust, lubricate or replace if necessary; C clean; R replace; A adjust; L lubricate. Every 4 years.
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.