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

Forza 125

Library entry covers 2015-2023

20 factory 34 guideline

Published source

Honda NSS125AD Owner's Manual 32K40L300 (English), Maintenance Schedule pp.75-76

Factory owner's handbook. Covers NSS125AD Forza 125; 2021 EU owner's manual 32K40L300.

Open the source

54 items for a 2015 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, twin shocks
Front brake: Disc, hydraulic
Rear brake: Disc, hydraulic
Wheels: Cast / alloy, tubeless
Sidecar: No sidecar

Maintenance schedule

2015 Honda Forza 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 3,000 mi or 12 months

4 items

Adjust automatic / semi-automatic clutch

Primary and gearbox

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
Check wheel bearings for play

Wheels and tires

Guideline

Every 4,000 mi or 12 months

11 items

Change engine oil

Engine

Factory

Manual: Engine oil (replace). Factory: Replace at 1000 km initial, then every 6000 km; annual check
Engine idle speed (inspect)

Engine

Factory

Factory: Every 6000 km; annual check
Inspect, clean and gap spark plugs

Engine

Guideline
Check throttle cable(s) free play and return

Fuel and air

Factory

Manual: Throttle operation (inspect). Factory: Every 6000 km; annual check
Replace fuel lines

Fuel and air

Factory

Manual: Fuel line (inspect). Factory: Every 6000 km; annual check
Battery (inspect)

Ignition and electrics

Factory

Factory: Every 6000 km
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.
Grease and check center / side stand and springs

Rear suspension and frame

Factory

Manual: Side stand (inspect). Factory: Every 6000 km; annual check
Inspect rear shocks for leaks and damping

Rear suspension and frame

Factory

Manual: Suspension (inspect). Factory: Every 6000 km; annual check
Check brake pads and discs

Brakes

Factory

Manual: Brake pads wear (inspect). Factory: Every 6000 km; annual check
Inspect tire tread, sidewalls and date codes

Wheels and tires

Factory

Manual: Wheels/tires (inspect). Factory: Every 6000 km; pre-ride check

Every 4,000 mi

2 items

Check and adjust valve clearances

Engine

Factory

Manual: Valve clearance (inspect). Factory: Every 6000 km; dealer item
Check engine breather and oil return

Engine

Factory

Manual: Crankcase breather (clean). Factory: Clean every 6000 km; more often in rain or at full throttle

Every 5,000 mi or 12 months

1 item

Replace oil filter

Engine

Guideline

Every 6,000 mi or 12 months

6 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
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 8,000 mi or 12 months

1 item

Check steering head bearing adjustment

Front end

Factory

Manual: Steering head bearings (inspect). Factory: Every 12000 km; annual check; dealer item

Every 8,000 mi

3 items

Clean oil strainers / mesh screens

Engine

Factory

Manual: Engine oil strainer screen (clean). Factory: Clean at 12000, 24000, 36000 km
Replace spark plugs

Engine

Factory

Manual: Spark plug (replace). Factory: Inspect at 6000/18000/30000 km, replace at 12000/24000/36000 km
Clutch shoes wear (inspect)

Primary and gearbox

Factory

Factory: Every 12000 km; dealer item

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

Synchronize throttle bodies

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 12,000 mi

1 item

Replace air filter element

Fuel and air

Factory

Manual: Air cleaner (replace). Factory: Replace at 18000 and 36000 km; sooner in wet or dusty areas

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

1 item

Replace drive belt (wear or damage based)

Final drive

Factory

Manual: Drive belt (replace). Factory: Inspect at 12000 and 36000 km, replace at 24000 km; dealer item

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

Inspect wiring, bullet connectors and ground points

Ignition and electrics

Guideline
Change final drive (rear drive) oil

Final drive

Factory

Manual: Final drive oil (replace). Factory: Every 2 years; replacement requires mechanical skill
Inspect frame, welds and lugs for cracks

Rear suspension and frame

Guideline
Replace brake fluid

Brakes

Factory

Manual: Brake fluid (replace). Factory: Every 2 years; check level every 6000 km and pre-ride

Every 3 years

1 item

Replace coolant

Engine

Factory

Manual: Radiator coolant (replace). Factory: Every 3 years; inspect every 12000 km, annually and pre-ride

Every 4 years

2 items

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.