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

Mio 50

Library entry covers 2007-2025

36 factory 48 guideline

Published source

SYM Mio 50 Service Manual, Periodical Maintenance Schedule p.2-2

Factory service manual. Covers SYM Mio 50 service manual (ManualsLib 805092).

84 items for a 2010 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, single shock / cantilever
Front brake: Disc, hydraulic
Rear brake: Drum (or band / belt rim)
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2010 SYM Mio 50

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 600 mi or 1 month

11 items

Cushion operation check

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Emission check in idling

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. A at 300 km; I every 1,000 km or 1 month
Every screw tightening check

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Exhaust pipe (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Gear oil check for leaking

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Lights/electrical equipment/multi-meters (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Battery inspection

Ignition and electrics

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Ignition timing (inspect)

Ignition and electrics

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Steering handle check

Front end

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Brake & free play check

Brakes

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month
Tire pressure (inspect)

Wheels and tires

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 1,000 km or 1 month

Every 600 mi

1 item

Engine oil change

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R at 300 km; replacement for every 1,000 km

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 1,200 mi

1 item

Crankcase vapor control system (replace)

Controls and cables

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km; replacement for every 2,000 km

Every 1,900 mi or 3 months

11 items

2nd air jet cleaner (clean)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km; C every 3,000 km and 6,000 km
2nd air jet system (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I every 3,000 km
Crankcase blow-by over-flow pipe

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km; C every 6,000 km
Engine bolt tightening (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km
Spark plug check

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km
Throttle operation (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km
Valve clearance

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km; C every 3,000 km
Air cleaner (clean)

Fuel and air

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km; C every 3,000 km and 6,000 km; R every 12,000 km or 1 year; more often on dusty roads
Fuel lines (inspect)

Fuel and air

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km
Cam chain (adjust)

Final drive

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km; A every 3,000 km
Shock absorbers (inspect)

Rear suspension and frame

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 3,000 km

Every 3,000 mi or 12 months

9 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 wheel bearings for play

Wheels and tires

Guideline

Every 3,100 mi

1 item

Gear oil change

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R at 300 km; replacement for every 5,000 km

Every 3,700 mi or 6 months

7 items

CVT driving device, belt (inspect)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I every 6,000 km or 6 months
CVT driving device, roller (clean)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. C every 6,000 km or 6 months
Oil filter (clean)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. C at 300 km, every 6,000 km and every 12,000 km
Spark plug change

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R every 6,000 km or 6 months
Fuel filter (inspect)

Fuel and air

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 6,000 km
Frame lubrication

Rear suspension and frame

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. L every 6,000 km or 6 months
Main/side stands & springs (inspect)

Rear suspension and frame

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. I at 300 km and every 6,000 km

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 7,500 mi or 12 months

4 items

2nd air jet cleaner (replace)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R every 12,000 km or 1 year
CVT driving device, belt (replace)

Engine

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R every 12,000 km or 1 year
Air cleaner (replace)

Fuel and air

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R every 12,000 km or 1 year
Fuel filter (replace)

Fuel and air

Factory

Factory: Periodical maintenance schedule columns: initial 300 km; every 1 month or 1,000 km; every 3 months or 3,000 km; every 6 months or 6,000 km; every year or 12,000 km; whichever comes first. Code I inspect/clean/adjust, C clean (replace if necessary), R replace, L lubricate. R every 12,000 km or 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

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 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 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 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

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.