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Aprilia · Two-stroke single, oil injection, CVT belt drive

SR 50

Library entry covers 1995-2023

47 factory 59 guideline

Published source

Aprilia SR 50 - SR 125 - SR 150 use and maintenance book, periodic maintenance charts pp.44-45 (ManualsLib)

Factory owner's handbook. Covers Aprilia SR 50 - SR 125 - SR 150 use and maintenance book (page footer prints it); SR 50 two-stroke charts pp.44-45; no year or edition printed on the pages read.

106 items for a 2018 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 oil injection (Autolube, Injectolube, Pilgrim pump...)
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: Automatic or semi-automatic
Final drive: Belt CVT, scooter automatic
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

2018 Aprilia SR 50

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

Every 500 km

1 item

Two-stroke oil (check)

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 500 km (312 mi).

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 2,000 km

2 items

Coolant (check)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 2000 km (1250 mi); change every 2 years.
Front and rear brake pad wear (check)

Brakes

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check at 500 km and every 2000 km (1250 mi).

Every 3,000 km or 12 months

1 item

Replace spark plugs (two-stroke)

Engine

Guideline

Every 4,000 km or 12 months

25 items

Accelerator operation

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Accelerator operation and oil mixer

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Braking system pipe (check)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi) or 12 months; change every 4 years.
General running of the vehicle

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Headlight beam direction and operation

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi) or 12 months.
Light system

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Mixer oil pipe (check)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check at 500 km and every 4000 km (2500 mi) or 12 months; change every 2 years.
Nut, bolt and screw tightening

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Spark plug (change)

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 4000 km (2500 mi) or 12 months.
Stop light switches

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi) or 12 months.
Two-stroke oil reserve warning light

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Air cleaner (clean)

Fuel and air

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check at 500 km; clean every 4000 km (2500 mi) or 12 months.
Carburetor idling (adjust and check)

Fuel and air

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Adjust at 500 km; check every 4000 km (2500 mi) or 12 months.
Battery terminal fastening and electrolyte level

Ignition and electrics

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Transmission cables and controls

Primary and gearbox

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Transmission oil (check)

Primary and gearbox

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change at 500 km; check every 4000 km (2500 mi) or 12 months.
Steering tube bearings and steering slack

Front end

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Brake discs (check)

Brakes

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Brake fluid (check)

Brakes

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi) or 12 months.
Brake locking operation

Brakes

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Braking systems and brake discs

Brakes

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Rear brake cam pin (grease)

Brakes

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Every 4000 km (2500 mi) or 12 months.
Rear brake shoe wear (check)

Brakes

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.
Wheel bearings (check)

Wheels and tires

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi) or 12 months.
Wheels, tires and inflation pressure

Wheels and tires

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. check at 500 km and every 4000 km (2500 mi) or 12 months.

Every 4,000 km

1 item

Fuel pipe (check)

Fuel and air

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 4000 km (2500 mi); change every 4 years.

Every 5,000 km or 12 months

12 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
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
Adjust automatic / semi-automatic clutch

Primary and gearbox

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 6,000 km

3 items

Movable/fixed front pulley (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 6000 km (3750 mi).
Variator belt (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 6000 km.
Variator front pins and guides (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 6000 km (3750 mi).

Every 6,500 km or 12 months

4 items

Check / bleed / adjust oil injection pump cable

Engine

Guideline
Inspect, clean and gap spark plugs

Engine

Guideline
Inspect CVT drive belt, rollers / sliders and clutch shoes

Final drive

Guideline

Typical scooter interval. Your owner's manual figure governs; check belt width against the service limit.
Lubricate brake cam spindles, check linings and drums

Brakes

Guideline

Every 8,000 km or 2 years

3 items

Front suspension (check)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 8000 km (5000 mi) or 24 months.
Clutch wear (check)

Primary and gearbox

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 8000 km (5000 mi) or 24 months.
Rear shock absorber (check)

Rear suspension and frame

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 8000 km (5000 mi) or 24 months.

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 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 12,000 km or 2 years

1 item

Transmission oil (change)

Primary and gearbox

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change at 500 km, then every 12000 km (7500 mi) or 2 years.

Every 12,000 km

3 items

Piston rings (check)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every 12000 km (7500 mi).
Rear pulley pins (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 12000 km (7500 mi).
Fork oil and oil seal (change)

Front end

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 12000 km (7500 mi).

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

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

2 items

Replace points and condenser

Ignition and electrics

Guideline
Replace CVT drive belt

Final drive

Guideline

Typical scooter interval, or sooner if the belt is cracked, glazed or below its width limit.

Every 20,000 km

1 item

Cylinder cooling system (outside cleaning)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Clean (outside) every 20000 km (12500 mi).

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 24,000 km

1 item

Replace brake linings / skim drums (wear based)

Brakes

Guideline

Every 25,500 km or 4 years

1 item

Replace spark plugs

Engine

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 1 month

1 item

Wheels, tires and inflation pressure (check)

Wheels and tires

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check every month.

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 2 years

7 items

Coolant (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 2 years.
Mixer oil pipe (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 2 years.
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
Brake fluid (change)

Brakes

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 2 years.
Replace brake fluid

Brakes

Guideline

Every 4 years

6 items

Braking system pipe (change)

Engine

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change every 4 years.
Replace oil injection delivery lines

Engine

Guideline
Fuel pipe (change)

Fuel and air

Factory

Factory: Periodic maintenance chart, operations for the Aprilia dealer (printed p.45, SR 50 two-stroke chart); same columns. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Change 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

No interval set

1 item

Spark plug (check)

Engine

Factory

Factory: Periodic maintenance chart, operations the user can carry out (printed p.44, SR 50 two-stroke chart); columns after running-in 500 km (312 mi), every 4000 km (2500 mi) or 12 months, every 8000 km (5000 mi) or 24 months. Key: check = check and clean, adjust, lubricate or change if necessary; C = clean; R = change; A = adjust. Check at 500 km.

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.