The 2025 Yamaha YZ125 is a race-ready 125cc two-stroke motocross bike Engine Engine: 125cc liquid-cooled, single-cylinder, 2-stroke Displacement: 125cc Bore × Stroke: 54.0 mm × 54.5 mm Compression Ratio: 8.2?10.1:1 Fuel System: Hitachi Astemo Keihin PWK38S carburetor Starting: Kick-start Transmission: 6-speed constant mesh Clutch: Wet, multi-plate Final Drive: Chain Chassis & Suspension Frame: Aluminum semi-double cradle Front Suspension: KYB Speed-Sensitive System (SSS) 48mm inverted fork, fully adjustable Travel: 11.8 in (300 mm) Rear Suspension: KYB fully adjustable shock Travel: 12.4 in (315 mm) Brakes Front: 270 mm hydraulic disc Rear: 240 mm hydraulic disc Wheels & Tires Front Tire: 80/100-21 Bridgestone Battlecross X20F Rear Tire: 100/90-19 Bridgestone Battlecross X20 Dimensions Wheelbase: 56.9 in (1,445 mm) Seat Height: 38.6 in (980 mm) Ground Clearance: 14.4 in (365 mm) Fuel Capacity: 1.8 gal (7.0 L) Wet Weight: 212 lb (96 kg) Key Features Updated high-performance 125cc two-stroke engine Lightweight aluminum chassis KYB race suspension with tool-free fork compression adjuster Hydraulic disc brakes front and rear Competition-ready ergonomics and aluminum handlebars Bridgestone Battlecross race tires
More powerful, more capable, more advanced. Offering the ideal blend of performance, reliability and usability to develop the skills to win.
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The 2025 Yamaha YZ125 is a race-ready 125cc two-stroke motocross bike
Engine
Engine: 125cc liquid-cooled, single-cylinder, 2-stroke
Displacement: 125cc
Bore × Stroke: 54.0 mm × 54.5 mm
Compression Ratio: 8.2?10.1:1
Fuel System: Hitachi Astemo Keihin PWK38S carburetor
Starting: Kick-start
Transmission: 6-speed constant mesh
Clutch: Wet, multi-plate
Final Drive: Chain
Chassis & Suspension
Frame: Aluminum semi-double cradle
Front Suspension: KYB Speed-Sensitive System (SSS) 48mm inverted fork, fully adjustable
Travel: 11.8 in (300 mm)
Rear Suspension: KYB fully adjustable shock
Travel: 12.4 in (315 mm)
Brakes
Front: 270 mm hydraulic disc
Rear: 240 mm hydraulic disc
Wheels & Tires
Front Tire: 80/100-21 Bridgestone Battlecross X20F
Rear Tire: 100/90-19 Bridgestone Battlecross X20
Dimensions
Wheelbase: 56.9 in (1,445 mm)
Seat Height: 38.6 in (980 mm)
Ground Clearance: 14.4 in (365 mm)
Fuel Capacity: 1.8 gal (7.0 L)
Wet Weight: 212 lb (96 kg)
Key Features
Updated high-performance 125cc two-stroke engine
Lightweight aluminum chassis
KYB race suspension with tool-free fork compression adjuster
Hydraulic disc brakes front and rear
Competition-ready ergonomics and aluminum handlebars
Bridgestone Battlecross race tires