Yamaha Yz 450 F vs Kawasaki Kx125
Side-by-side comparison for used motorcycle buyers
Performance at a Glance
Green = winner per metric · Bars are relative to the higher value
Yamaha Yz 450 F
Kawasaki Kx125
Horsepower (hp)
62 hp
38 hp
Torque (Nm)
52 Nm
29 Nm
Top Speed (km/h)
145 km/h
110 km/h
Weight (kg) — lower is better
110 kg
88 kg
Type
Motocross
Motocross
Horsepower
~62 hp @ 9,500 rpm (note: figure based on modern 2020+ models; earlier models ranged 55-60 hp)
~38 hp @ 11,500 rpm (2003–2005 final spec)
Torque
~52 Nm @ 7,500 rpm (note: estimated based on published dyno data for recent models)
~29 Nm @ 10,500 rpm (estimate for late-model spec)
Top Speed
~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain)
~110 km/h (estimate — highly dependent on gearing and conditions)
Weight
110 kg (wet/curb weight, based on 2020+ models)
~88 kg (wet/curb weight, 2005 model)
Fuel
Estimate: ~6-8 L/100km under typical motocross/off-road riding conditions (note: highly variable depending on riding intensity; not designed for road use)
~4.0 L/100km or ~25 km/L (estimate — varies significantly with riding intensity; motocross use is higher consumption)
Fairing
No
No
Individual Reviews
Yamaha Yz 450 F
8.5/10
"An unforgiving elite machine that rewards experienced, mechanically-aware riders only."
Pros
+Bulletproof engine when maintained
+Reverse cylinder improves balance
+Electric start on later models
Cons
−Brutal for inexperienced riders
−Maintenance intervals are short
−Suspension wears quickly hard use
Kawasaki Kx125
8.0/10
"A brilliant buy if you inspect carefully and ride hard."
Pros
+Razor-sharp chassis handling
+Lightweight, flickable frame
+Strong parts availability still
Cons
−Punishing if neglected
−Narrow, unforgiving powerband
−Fuel economy is terrible
Top 10 Accessories
Picks that work on either bike.
