2021 Yamaha Gear 125 S Specifications

Name: 2021 Yamaha Gear 125 S
Brand: Yamaha

Scooter • Specs last verified 13 July 2026

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2021 Yamaha Gear 125 S Overview

The 2021 Yamaha Gear 125 S is a scooter motorcycle built around 125 cc of displacement. Under the tank sits a Single cylinder, four-stroke engine, a compression ratio of 9.5:1. The bore and stroke measures 52.4 x 57.9 mm. 2021 Yamaha Gear 125 S delivers 9.5 Nm @ 5500 Revolutions of torque. From a practical standpoint, the 2021 Gear 125 S tips the scales at 96 kg. That's roughly 89.9 kg lighter than the average scooter motorcycle in our database. Scroll down for the complete 2021 Yamaha Gear 125 S spec sheet covering every technical detail from suspension travel to tyre sizes.

2021 Gear 125 S - Pros & Cons

Strengths

Fuel injection: The fuel injection system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Low-maintenance final drive: Belt (final drive) final drive means no chain to clean, lube or adjust - meaningfully less routine maintenance than a chain-driven equivalent.

Considerations

Age-related wear: As with any used Gear 125 S, a thorough pre-purchase inspection covering consumables, service history and tyres is always recommended.

Wear Points & Servicing Notes

Fuelling & injector care

Fuelling comes from fuel injection. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.

Brake disc and pad wear

The Single disc front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.

Suspension condition on used examples

Up front, the Gear 125 S runs Telescopic and Unit Swing at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.

Final drive maintenance

Final drive is by belt - lower maintenance than chain with no lubrication needed, but tension and tooth wear should still be checked at service intervals.

Low-speed handling

At just 96 kg, the Gear 125 S is light enough to manhandle easily at a standstill - one of the practical advantages of its class.

Gear 125 S - Buying & Maintenance Guide

What to check before buying

When inspecting a used 2021 Yamaha Gear 125 S, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained Gear 125 S should fire up cleanly and settle to a smooth idle within a few seconds.

Oil and filter changes

Regular oil changes are the single most important maintenance task on any Gear 125 S. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.

Fuel system care

The Gear 125 S's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.

2021 Yamaha Gear 125 S - Frequently Asked Questions

What engine does the 2021 Yamaha Gear 125 S have?

The 2021 Yamaha Gear 125 S uses a Single cylinder, four-stroke engine with 125 cc of displacement.

How much does the 2021 Yamaha Gear 125 S weigh?

The 2021 Yamaha Gear 125 S weighs 96 kg. This is the manufacturer's wet figure.

How much power does the 2021 Yamaha Gear 125 S make?

The 2021 Yamaha Gear 125 S produces 9.5 Nm @ 5500 Revolutions of torque.

What brakes does the 2021 Yamaha Gear 125 S have?

The 2021 Yamaha Gear 125 S uses Single disc at the front and Single disc at the rear.

What tyre sizes does the 2021 Yamaha Gear 125 S use?

The front tyre size on the 2021 Yamaha Gear 125 S is 80/80-14.

What fuel system does the 2021 Yamaha Gear 125 S use?

The 2021 Yamaha Gear 125 S uses Injection, providing precise fuelling across the rev range and reliable cold-start behaviour.

What suspension does the 2021 Yamaha Gear 125 S have?

The 2021 Yamaha Gear 125 S uses Telescopic up front and Unit Swing at the rear.

Key Specifications

Engine

Single cylinder, four-stroke

Power

Not published by manufacturer

Torque

9.5 Nm (1.0 kgf-m or 7.0 ft.lbs) @ 5500 Revolutions

Top Speed

Not published by manufacturer

Weight

96.0 kg / 211.6 lbs

Fuel Capacity

Not published by manufacturer

Full 2021 Yamaha Gear 125 S Specifications

Comments Sold in Asia

Colours Prestige Silver, Matte Red

Height 1060 mm / 41.7 in.

Length 1870 mm / 73.6 in.

Width 685 mm / 27.0 in.

Wet Weight 96.0 kg / 211.6 lbs

Max Torque 9.5 Nm (1.0 kgf-m or 7.0 ft.lbs) @ 5500 Revolutions

Bore x Stroke (in,) 2.1 x 2.3 inches

Bore x Stroke (mm) 52.4 x 57.9 mm

Displacement (cc) 125.0 cc

Displacement (ci) 7.63 cubic inches

Engine Type Single cylinder, four-stroke

Fuel System Injection

Compression Ratio 9.5:1

Engine Lubrication Wet sump

Ignition TCI

Starter Electric & kick

Clutch Single Dry Clutch

Final Drive Belt (final drive)

Suspension - Front Telescopic

Suspension - Rear Unit Swing

Brakes - Front Single disc

Brakes - Rear Single disc

Tyres - Front 80/80-14

Specifications are compiled from manufacturer documentation and cross-referenced technical sources, and corrected on an ongoing basis. Spot an error? Let us know.