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

GTS 125

Library entry covers 2007-2014

33 factory 48 guideline

Published source

SYM scooter owner's manual with GTS 125 specifications, periodical maintenance schedule printed p.30 (ManualsLib 874279 p.32)

Factory source. Covers SYM owner's manual printing GTS 125 in its specifications table; no edition year seen.

81 items for a 2013 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: Fuel injection
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, single shock / cantilever
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2013 SYM GTS 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

On the road: every 500 mi

1 item

Check coolant level

Pre-ride / on the road

Guideline

Every 621 mi or 1 month

10 items

Bolts and nuts for each component (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Coolant (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Cooling fan, lines (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Crankcase leakage (check)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Engine oil (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I every 1,000 km / 1 month.
Battery (inspect)

Ignition and electrics

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Transmission leakage (check)

Primary and gearbox

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Brake mechanism / brake pads (inspect)

Brakes

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Tire pressure (inspect)

Wheels and tires

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.
Throttle valve operation and cable (inspect)

Controls and cables

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 1,000 km / 1 month.

Every 1,000 mi or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 1,864 mi or 3 months

7 items

Crankcase blow-by system, PCV (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.
Engine bolts and nuts (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.
Spark plug (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.
Air cleaner element (clean)

Fuel and air

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km; C every 3,000 km / 3 months. Clean or replace more often in dusty or polluted conditions.
Fuel tank switch and lines (inspect)

Fuel and air

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.
Cam chain / ignition timing (inspect)

Final drive

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.
Steering bearing and handles (inspect)

Front end

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 3,000 km / 3 months.

Every 1,864 mi

1 item

Engine oil (replace)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R at 300 km, then every 3,000 km (2,000 mi).

Every 3,000 mi or 12 months

8 items

Check throttle cable(s) free play and return

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 wheel bearings for play

Wheels and tires

Guideline

Every 3,107 mi or 5 months

1 item

Transmission oil (replace)

Primary and gearbox

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R at 300 km, then every 5,000 km or 3,000 mi (5 months).

Every 3,728 mi or 6 months

11 items

Cylinder head, cylinder and piston (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I every 6,000 km / 6 months.
Drive belt / roller (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I every 6,000 km / 6 months.
Front/rear suspension (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 6,000 km / 6 months.
Oil filter screen (clean)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. C at 300 km, then every 6,000 km / 6 months.
Valve clearance (inspect)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 6,000 km / 6 months.
Air cleaner element (replace)

Fuel and air

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R every 6,000 km / 6 months.
Carburetor idle speed (inspect)

Fuel and air

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 6,000 km / 6 months.
Exhaust system, carbon cleaning (inspect)

Fuel and air

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I every 6,000 km / 6 months.
Clutch disk (inspect)

Primary and gearbox

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I every 6,000 km / 6 months.
Main/side stands (inspect, lubricate)

Rear suspension and frame

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then I/L every 6,000 km / 6 months.
Shock absorbers (inspect)

Rear suspension and frame

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. I at 300 km, then every 6,000 km / 6 months.

Every 4,000 mi or 12 months

2 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.

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

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.
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 7,457 mi or 12 months

3 items

Coolant (replace)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R every 12,000 km / 1 year.
Drive belt / roller (replace)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R every 12,000 km / 1 year.
Spark plug (replace)

Engine

Factory

Factory: Periodical maintenance schedule (SYM scooter owner's manual with GTS 125 specifications, printed p.30; columns new at 300 km (200 mi), every 1,000 km / 1 month, every 3,000 km / 3 months, every 6,000 km / 6 months, every 12,000 km / 1 year). Codes: I = inspection, cleaning and adjustment; R = replacement; C = cleaning (replace if necessary); L = lubrication. R every 12,000 km / 1 year.

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

4 items

Replace air filter element

Fuel and air

Guideline
Synchronize throttle bodies

Fuel and air

Guideline
Clean and grease rear suspension linkage

Rear suspension and frame

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 16,000 mi or 4 years

1 item

Replace spark plugs

Engine

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 24,000 mi or 4 years

1 item

Replace fuel filter

Fuel and air

Guideline

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 2 years

4 items

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
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

1 item

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.