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Hyosung · Shim-adjusted overhead-cam four-stroke, wet sump, gearbox shares engine oil, chain drive

Aquila GV125S

Library entry covers 2021

27 factory 52 guideline

Published source

Hyosung GV125S Owner's Manual, Periodic maintenance chart p.57 (ManualsLib 2630956 page 60)

Factory owner's handbook. Covers Hyosung GV125S owner's manual (ManualsLib 2630956), no edition year printed.

79 items for a 2021 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, shim adjusted (incl. desmo)
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
Shares engine 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
Cast / alloy, tubeless
Sidecar
No sidecar
Maintenance schedule

2021 Hyosung Aquila GV125S

On the road: every 300 km

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 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 1,000 km

1 item
  • Drive chain (clean, lubricate)
    Final drive
    Factory

    Factory: Periodic maintenance chart (p.57): clean and lubricate every 1,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

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

1 item
  • Air cleaner element (clean)
    Fuel and air
    Factory

    Factory: Periodic maintenance chart (p.57): clean every 3,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

Every 4,000 km

19 items
  • Chassis nuts and bolts (tighten)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): tighten at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Cylinder head bolts (tighten)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): tighten at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Engine oil (replace)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): replace at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Engine oil filter (replace)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): replace at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Exhaust pipe nuts and muffler mounting bolts (tighten)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): tighten at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • General lubrication
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): lubricate at the first 1,000 km and every 4,000 km (lubrication points p.56: clutch lever holder and cable, footrest pivots, drive chain, side stand pivot and spring hook, front brake lever holder, throttle cable, speedometer sensor, rear brake pedal pivot). Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Idle speed (inspect)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Spark plug (clean)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): clean at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Valve clearance (inspect, adjust)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Fuel hose (inspect)
    Fuel and air
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Clutch (inspect)
    Primary and gearbox
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Front forks (inspect)
    Front end
    Factory

    Factory: Periodic maintenance chart (p.57): inspect every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Steering (inspect)
    Front end
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Rear shock absorber (inspect)
    Rear suspension and frame
    Factory

    Factory: Periodic maintenance chart (p.57): inspect every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Brake fluid (inspect)
    Brakes
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Brake hoses (inspect)
    Brakes
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Brakes (inspect)
    Brakes
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Tires (inspect)
    Wheels and tires
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Throttle cable (inspect)
    Controls and cables
    Factory

    Factory: Periodic maintenance chart (p.57): inspect at the first 1,000 km and every 4,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

Every 5,000 km or 12 months

9 items
  • Check throttle cable(s) free play and return
    Fuel and air
    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 wheel bearings for play
    Wheels and tires
    Guideline

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 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 8,000 km

1 item
  • Spark plug (replace)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 8,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

Every 9,500 km 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 10,000 km

1 item
  • Antifreeze (replace)
    Engine
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 10,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

Every 12,000 km

1 item
  • Air cleaner element (replace)
    Fuel and air
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 12,000 km. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

Every 16,000 km or 2 years

1 item
  • Compression test (or leak-down)
    Engine
    Guideline

Every 19,500 km or 2 years

3 items
  • Replace air filter element
    Fuel and air
    Guideline
  • Synchronize throttle bodies
    Fuel and air
    Guideline
  • Grease swingarm pivot
    Rear suspension and frame
    Guideline

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 or 4 years

1 item
  • Check valve clearances (shim adjusted)
    Engine
    Guideline

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 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 38,500 km or 4 years

1 item
  • Replace fuel filter
    Fuel and air
    Guideline

Every 40,000 km or 6 years

1 item
  • Replace swingarm bushes / bearings
    Rear suspension and frame
    Guideline

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 2 years

5 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
  • Brake fluid (replace)
    Brakes
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 2 years. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Replace brake fluid
    Brakes
    Guideline

Every 4 years

5 items
  • Fuel hose (replace)
    Fuel and air
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 4 years. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • Replace fuel lines
    Fuel and air
    Guideline

    Old rubber and modern ethanol fuel do not mix well.

  • Brake hoses (replace)
    Brakes
    Factory

    Factory: Periodic maintenance chart (p.57): replace every 4 years. Marked with a star: have a qualified mechanic do it. Columns: first 1,000 km, every 4,000 km, every 8,000 km. Service more often under high stress (continuous full throttle) or in dusty conditions.

  • 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.

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