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SYM · Overhead-cam four-stroke single, wet sump, separate gearbox oil, CVT belt drive

Symphony 125

Library entry covers 2010-2025

29 factory 49 guideline

Published source

SYM Symphony ST/SR 50 / 125i Euro 4 Bedienungsanleitung (German), Periodischer Wartungsplan printed p.26

Factory source. Covers SYM Germany Bedienungsanleitung Symphony ST/SR 50 and 125i, Euro 4 (one table for all versions; the file URL shows a 2019 upload); other editions not compared.

78 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: Four-stroke
Engine lubrication: Wet sump (oil in crankcase)
Oil filtration: Replaceable cartridge or spin-on filter
Valve gear: Overhead cam, screw/locknut adjusters
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: 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

2020 SYM Symphony 125

On the road: every 200 mi

1 item

Check engine oil level

Pre-ride / on the road

Guideline

Each fuel stop on old machines. Dry sump: check the tank hot, engine idling or just stopped, per your manual.

On the road: every 300 mi

2 items

Check lights, horn, brake light switches

Pre-ride / on the road

Guideline
Check tire pressures

Pre-ride / on the road

Guideline

Every 621 mi or 1 month

12 items

Important fasteners (check)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Lighting, adjustment and function (check)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Spark plug (check)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Throttle adjustment and free play (check)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Air filter element (check)

Fuel and air

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km and every 1,000 km; replace every 5,000 km in dusty use; never clean with compressed air. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Fuel lines and filter (check)

Fuel and air

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Battery (check)

Ignition and electrics

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Transmission case and engine case (check for leaks)

Primary and gearbox

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Steering and bearings (check)

Front end

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Brake fluid (check)

Brakes

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km and every 1,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Brake system, lines and pads (check)

Brakes

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Tires and tire pressure (check)

Wheels and tires

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 1,000 mi 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 1,864 mi or 3 months

3 items

Crankcase ventilation, PCV (check, clean)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km and every 1,000 km; C every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Engine oil (replace)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): R at 300 km, then every 3,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Air filter element (clean)

Fuel and air

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): C every 3,000 km or 3 months. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 3,000 mi or 12 months

10 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
Clean fuel tap filter / sediment bowl

Fuel and air

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 3,728 mi or 6 months

9 items

Drive belt, rollers and variator (clean)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): C every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Gear oil (replace)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): R at 300 km, then every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Oil filter screen (clean)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): C at 300 km, I every 1,000 km; clean every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Throttle body (clean)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Valve clearance (check)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Clutch, clutch bell and centrifugal clutch (clean)

Primary and gearbox

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): C every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Cam chain (check)

Final drive

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Center and side stands (check and lubricate)

Rear suspension and frame

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km; I/L every 1,000 km and every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Shock absorbers and front and rear suspension (check)

Rear suspension and frame

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): I at 300 km, then every 1,000 km and every 6,000 km. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 4,000 mi or 12 months

3 items

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 5,000 mi or 12 months

2 items

Change engine oil

Engine

Guideline

Pre-1970 machines: many owners run non-detergent or classic-spec oil with no filter, so short intervals matter. Dry sump: drain the tank and the crankcase/sump, flush the tank and clean the feed and return screens.
Replace oil filter

Engine

Guideline

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 6,214 mi

1 item

Brake caliper and master cylinder internals (clean, replace if needed)

Brakes

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): every 10,000 km if needed (note). Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 7,456 mi or 12 months

2 items

Drive belt, rollers and variator (replace)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): R every 12,000 km or 12 months. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.
Spark plug (replace)

Engine

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): R every 12,000 km or 12 months. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 8,000 mi or 2 years

1 item

Check and adjust valve clearances

Engine

Guideline

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

2 items

Replace air filter element

Fuel and air

Guideline
Grease swingarm pivot

Rear suspension and frame

Guideline

Every 12,000 mi or 3 years

1 item

Replace CVT drive belt

Final drive

Guideline

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

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 15,000 mi

1 item

Replace brake linings / skim drums (wear based)

Brakes

Guideline

Every 16,000 mi or 4 years

1 item

Replace spark plugs

Engine

Guideline

Every 18,641 mi or 2 years

1 item

Brake fluid (replace)

Brakes

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): every 30,000 km or 2 years. Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

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 37,282 mi or 4 years

1 item

Brake hoses (replace)

Brakes

Factory

Factory: 16. Periodischer Wartungsplan (printed p.26): every 4 years or 60,000 km (note). Columns as printed: once at 300 km, every 1,000 km or 1 month, every 3,000 km or 3 months, every 6,000 km or 6 months, every 12,000 km or 12 months. Key: I check, clean, adjust if needed; R replace; C clean (replace if needed); L lubricate. Intervals may be exceeded by at most 10%; shorten them in dust or hard use. Translated from German.

Every 6 months

1 item

Clean battery terminals, check charge and strap

Ignition and electrics

Guideline

Every 2 years

3 items

Inspect wiring, bullet connectors and ground points

Ignition and electrics

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

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.