Yamaha YZ125X - 2026 Specifications and Reviews

The 2026 Yamaha YZ125X is a lightweight 125cc 2-stroke motocross bike designed for amateur and intermediate riders seeking competitive performance on the track. Known for its responsive handling, aggressive power delivery, and nimble chassis, it excels in tight technical sections while remaining manageable for developing riders advancing their racing skills.

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Engine and Transmission Specifications

Capacity125 cc
Final DriveChain
Gearbox6-speed; multiplate wet clutch
InductionHitachi Astemo® Keihin PWK38S
Compression Ratio7.8~10.2:1
Bore x Stroke54.0 mm x 54.5 mm
Engine Type125cc liquid-cooled 2-stroke; reed-valve inducted
 
 

Physical measures and capacities

Ground Clearance356 mm (14´´)
Overall Height1,290 mm (50.8´´)
Overall Width825 mm (32.5´´)
Overall Length2,154 mm (84.8´´)
Wet Weight212 lb
Wheelbase57.3 in
Seat Height38.2 in
Fuel Capacity1.8 gal
 
 

Yamaha YZ125X dimensions and frame

Trail4.4 in

Other specs

MaintenanceFind parts, fluids, filters, maintenance tools and service items on eBay

Performance Profile & Rider Fit

Best For

Track55%
City10%
Cornering85%
Daily Riding10%
Touring10%
Passenger5%

Rider Profile

Best ForBest suited to intermediate-to-advanced off-road riders who understand 2-stroke power delivery and clutch management.
PurposeBuilt as a cross-country/off-road competition machine, essentially a trail-tuned YZ125 motocrosser with wider-ratio gearing and off-road suspension settings.
Rider FitVery light wet weight and tall seat height demand an active, fit rider comfortable standing and shifting body weight through rough terrain.
CharacterRaw, high-strung, and reward-driven, this bike delivers sharp, punchy 2-stroke power and razor-sharp agility for riders who like to work the bike hard.
Not Ideal ForNot for riders seeking comfort, highway capability, passenger accommodation, or a low-maintenance, easy-going ride.

Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.

Rider Reviews

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