2023 Yamaha YZ125X Bike



Yamaha YZ125X Bike
Model Year
Engine Size
Engine Type
Engine Displacement
Bore x Stroke
54.0 mm x 54.5 mm
Compression Ratio
7.8 ~ 10.2:1
Fuel System
Hitachi Astemo Keihin PWK38S carburetor, reed valve induction
Kick start
Close-ratio 6-speed; multiplate wet clutch
Final Drive
Chain, sealed O-ring
Suspension Front
KYB Speed-Sensitive System inverted fork, fully adjustable, leaf spring in the mid-speed valve, 48 mm diameter, 300 mm (11.8") travel
Suspension Rear
KYB single shock, fully adjustable, separate adjusters for high- and low-speed compression damping, full lock oil rebound system, reduced-friction Kashima Coat internals, 315 mm (12.4") travel
Brakes Front
Hydraulic disc, 270 mm rotor
Brakes Rear
Hydraulic disc, 240 mm rotor
Tires Front
Dunlop Geomax MX33F, 80/100-21"
Tires Rear
Dunlop Geomax MX33, 110/100-18"
Overall Length
2154 mm (84.8")
Overall Width
826 mm (32.5")
Overall Height
1290 mm (50.8")
Seat Height
970 mm (38.2")
1455 mm (57.3")
Ground Clearance
356 mm (14.0")
26.4° / 4.4"
Fuel Capacity
6.8 liters (1.8 gallons)
Curb Weight
96.16 kg (212 lbs) with full fuel tank
• Completely redesigned engine with new cylinder body, cylinder head, piston, piston pin, connecting rod, crankcase, and expansion chamber, with revised cylinder port shape and updated cylinder port timing
• New high-precision Hitachi Astemo Keihin PWK38S carburetor features a power jet, throttle position sensor and 3D-map-controlled CDI unit for precise ignition timing
• Updated intake design allows for a straighter, more efficient draw of air into the intake tract
• Revised Yamaha Power Valve System (YPVS) timing with digital CDI unit and updated compression ratio
• Compact exhaust expansion chamber to improve both horizontal and vertical clearance on tight, technical trails
• Revised transmission has wider gear tooth width and new, optimized gear ratios for maximum performance
• A racy "gripper"-type seat and narrow fuel tank, combined with a tapered aluminum handlebar and adjustable mounts, create greater freedom of movement and more comfortable ergonomics for riders
• New front and rear fender design and new radiator shrouds
• Standard side stand
• Reserve fuel petcock
• New front fork internals and revised suspension settings
• Newly adopted scraper between the fork's dust and oil seal
• Updated front braking system features larger pistons, a more rigid caliper and a redesigned 270mm rotor with a 30% increase in pad contact area
• Redesigned rear rotor maintains the same braking power while dropping outer diameter from 245mm to 240mm, reducing unsprung weight
• Cooling: liquid
• Frame: aluminum semi-double cradle, with removable aluminum rear subframe featuring square-section tubing
• Radiator: high-capacity
• Rims: Excel
• 30 day limited factory warranty
More Info
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