Yamaha Yz 450 F vs Ktm Sx 450
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
Ktm Sx 450
Horsepower (hp)
62 hp
63 hp
Torque (Nm)
52 Nm
54 Nm
Top Speed (km/h)
145 km/h
145 km/h
Weight (kg) — lower is better
110 kg
106 kg
Type
Motocross
Motocross
Horsepower
~62 hp @ 9,500 rpm (note: figure based on modern 2020+ models; earlier models ranged 55-60 hp)
~63 hp @ 9,500 rpm (estimated for modern 2020+ generation)
Torque
~52 Nm @ 7,500 rpm (note: estimated based on published dyno data for recent models)
~54 Nm @ 7,000 rpm (estimated for modern 2020+ generation)
Top Speed
~145 km/h (note: estimated under optimal conditions on a straight; varies by rider and terrain)
~145 km/h (estimated; note: motocross bikes are not optimized for top speed, this is an approximate real-world figure)
Weight
110 kg (wet/curb weight, based on 2020+ models)
~106 kg (wet/curb weight, varies slightly by model year)
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)
~7–9 L/100km (estimated; highly variable depending on riding intensity — note: motocross bikes are not typically measured by fuel economy)
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
Ktm Sx 450
8.5/10
"Extraordinary machine that ruthlessly punishes neglectful owners and rewards disciplined ones."
Pros
+Best-in-class power delivery
+Exceptional factory-grade suspension
+Lightweight chromoly frame
Cons
−Brutal mandatory maintenance schedule
−Unforgiving for intermediate riders
−Expensive genuine KTM parts
Top 10 Accessories
Picks that work on either bike.
