Naked bike · 2025

Yz125 Monster Energy Edition

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Technical Overview

2025 Yamaha Yz125 Monster Energy Edition Technical Analysis & Specification Breakdown

Positioned in Yamaha's naked motorcycle lineup, the 2025 Yamaha Yz125 Monster Energy Edition relies on a 125 cc engine powerplant. Internal engine geometry specifies a bore and stroke of 54.0mm x 54.5mm with a 8.2~10.1:1 compression ratio.

On the scales, the Yz125 Monster Energy Edition measures 209 kg (461 lbs) wet (curb). Rider ergonomics and chassis geometry center around a 38 mm (1.5 in) seat height — giving shorter riders and urban commuters confident flat-foot reach at traffic stops, combined with a 56 mm (2.2 in) wheelbase engineered for quick, flickable steering geometry. The 1.8-liter (0.5 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Standover Height

38 mm (1.5 in)

Engine

Displacement 125 cc

Engine Details 125cc liquid-cooled 2-stroke; reed-valve inducted

Compression 8.2~10.1:1

Bore x Stroke 54.0mm x 54.5mm

Transmission

Gearbox Constant-mesh 6-speed; multiplate wet clutch

Final Drive Chain

Chassis

Trail 4.3 in

Wheelbase 56.9 in

Ground Clearance 14.4 in

Dimensions & Weight

Weight incl. 209 lb

Seat Height 38.6 in

Fuel Capacity 1.8 gal

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Seat Height

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Fuel Capacity

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Transmission

Transmission and final drive affect maintenance, smoothness and everyday usability.

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Best For

City & Weekend Rides

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