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KSR · Overhead-cam four-stroke single, wet sump, gearbox shares engine oil, chain drive

GRS (125 cc)

Library entry covers 2016-2021

30 factory 48 guideline

Published source

KSR GRS 125 User Manual (mod.# U 14), Maintenance schedule printed p.48 (ManualsLib 2519413 page 49)

Factory owner's handbook. Covers KSR user manual (cover: USER MANUAL, mod.# U 14) listed on ManualsLib as the KSR GRS 125 user manual; the manual does not print the model name or year in the pages read. The table's scooter-only rows (variomatic belt, fly wheels) are left out..

78 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, 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: 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: Disc, hydraulic
Wheels: Spoked, tubed
Sidecar: No sidecar

Maintenance schedule

2021 KSR GRS (125 cc)

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 1,000 km

1 item

Check chain slack and rear wheel alignment

Pre-ride / on the road

Guideline

Every 1,600 km or 6 months

1 item

Inspect tire tread, sidewalls and date codes

Wheels and tires

Guideline

Every 3,000 km or 6 months

21 items

Air filter (clean)

Fuel and air

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Clutch (control)

Primary and gearbox

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Drive chain/sprockets (control/clean)

Final drive

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Row marked *. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Front fork (control)

Front end

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Steering bearing (control/clean)

Front end

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; lubricate at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Brake system (control/clean/exchange)

Brakes

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Tires (control, tire pressure)

Wheels and tires

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Wheel bearing (control/exchange)

Wheels and tires

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Wheels, rims (control)

Wheels and tires

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Cables/bowden (control/clean/lubricate)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Coolant (control)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Row marked *. Only use duration coolant. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Cover part screws (control/tighten)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Engine oil (control)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): exchange at 1,000 km or 1 month; check at 4,000 km or 6 months; exchange at 7,000 km or 12 months; check at 10,000 km or 18 months; exchange at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Exhaust system (control/tighten)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Fuel line/fuel filter (control)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; exchange at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Idle speed (control/adjust)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Lights/switches (control/adjust)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Main stand (control/clean/lubricate)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Rear suspension (control)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Throttle (control/adjust/lubricate)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Valves, engine (control/adjust)

Controls and cables

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 4,000 km or 6 months; check at 7,000 km or 12 months; check at 10,000 km or 18 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.

Every 5,000 km or 12 months

11 items

Check throttle cable(s) free play and return

Fuel and air

Guideline
Clean fuel tap filter / sediment bowl

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 spoke tension and wheel true

Wheels and tires

Guideline
Check wheel bearings for play

Wheels and tires

Guideline

Every 6,000 km or 12 months

3 items

Engine oil (exchange)

Engine

Factory

Factory: Maintenance schedule (p.48): exchange at 1,000 km or 1 month; check at 4,000 km or 6 months; exchange at 7,000 km or 12 months; check at 10,000 km or 18 months; exchange at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Oil filter (clean)

Engine

Factory

Factory: Maintenance schedule (p.48): check at 1,000 km or 1 month; check at 7,000 km or 12 months; check at 13,000 km or 24 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Transmission oil (exchange)

Primary and gearbox

Factory

Factory: Maintenance schedule (p.48): exchange at 1,000 km or 1 month; exchange at 7,000 km or 12 months; exchange at 13,000 km or 24 months. Row marked *. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.

Every 6,500 km or 12 months

2 items

Inspect, clean and gap spark plugs

Engine

Guideline
Adjust clutch free play, lubricate cable and lever pivot

Primary and gearbox

Guideline

Every 7,000 km

4 items

Spark plug (exchange)

Engine

Factory

Factory: Maintenance schedule (p.48), caution note: spark plug has to be exchanged every 7,000 km. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Air filter (exchange)

Fuel and air

Factory

Factory: Maintenance schedule (p.48): exchange at 7,000 km or 12 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Fuel filter (exchange)

Fuel and air

Factory

Factory: Maintenance schedule (p.48): exchange at 7,000 km or 12 months. The caution note says every 7,000 km. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
Drive chain/sprockets (exchange)

Final drive

Factory

Factory: Maintenance schedule (p.48), caution note: drive chain/sprocket have to be exchanged every 7,000 km. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.

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 9,500 km 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 13,000 km or 2 years

1 item

Check and adjust valve clearances

Engine

Guideline

Every 16,000 km or 2 years

1 item

Compression test (or leak-down)

Engine

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 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 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 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

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

4 items

Replace fuel lines

Fuel and air

Guideline

Old rubber and modern ethanol fuel do not mix well.
Brake lines (exchange)

Brakes

Factory

Factory: Maintenance schedule (p.48), caution note: brake lines have to be exchanged at least every 4 years. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.
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

Steering bearing (lubricate)

Front end

Factory

Factory: Maintenance schedule (p.48): lubricate at 10,000 km or 18 months. Printed only at 10,000 km or 18 months. Caution printed under the table: variomatic belt, fly wheels respectively drive chain/sprocket, spark plug, fuel filter and air filter element have to be exchanged every 7,000 km; only use duration coolant; brake lines have to be exchanged at least every 4 years; from 13,000 km or 24th month the inspection should be made every 7,000 km. Rows marked * may have model-specific deviations.

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.