[Update 2026] Yamaha YZF-R125 Technical Specs: The 2008–2026 Evolution

Yamaha YZF R125 for sale on Ebay UK

In 2014, we looked at the R125 as a simple, high-revving commuter. By 2026, the spec sheet looks more like a 600cc supersport. Whether you are buying a used Gen 1 or a brand new 2026 model, here is how the "Must-Buy" learner bike has changed over the years.

Quick Comparison Table: Gen 1 vs. Gen 4

1. The Engine Revolution (VVA)

The biggest technical leap occurred in 2019 with the introduction of Variable Valve Actuation (VVA).

• The Benefit: It uses two different intake cam profiles. One for low-end "Income" (torque) and another that kicks in at 7,400 rpm for high-end speed. This keeps the bike learner-legal while making it much more flexible in traffic.

2. Chassis & Handling

While the Deltabox frame remains the backbone, the suspension has seen a massive upgrade.

• Gen 1: 33mm conventional telescopic forks.

• 2026 Model: 41mm KYB Upside-Down (USD) forks and a revised 26° caster angle for sharper turn-in.

3. Fuel Economy & Range

Despite the smaller 11L fuel tank on newer models, the efficiency has skyrocketed.

• 2026 Spec: Claimed 134 mpg (2.1L / 100km).

• The Reality: Even with a smaller tank, the theoretical range remains over 300 miles, making it one of the most efficient motorbikes for your wallet.

Make Model Yamaha YZF-R 125 

Year 2008

Engine Liquid cooled, four stroke, single cylinder, DOHC, SOHC, 4 valve

Capacity 124

Bore x Stroke 57 × 58.7mm

Compression Ratio 10.4:1

Induction Fuel Injection

Oil Capacity 1.20 liters / 0.08 quarts)

Lubrication Wet sump

Ignition TCI 

Starting Electric

Clutch Wet Multiple-disc

Max Power 12.6 kW 17 hp @ 8500 rpm

Max Torque 15 Nm  @ 7500 rpm

Transmission 6 Speed 

Final Drive Chain

Frame Delta box

Front Suspension Telescopic forks, 130mm wheel travel

Rear Suspension Swinging arm, 125mm wheel travel

Front Brakes Single 292mm disc

Rear Brakes Single 230mm disc

Front Tyre 90/80 -17

Rear Tyre 130/70 -17

Caster 26°

Trail 98 mm

Dimension Height 970 mm / 38.2 in

Length 2,015 mm / 79.3 in

Width 660 mm / 26.0 in

Wheelbase 1355 mm / 53.3 inc

Seat Height 800 mm

Wet-Weight 136 kg

Fuel Capacity 13.8 Litres