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All Bikes/Compare/Kawasaki Kx 250 vs Suzuki Rm-z 450

Kawasaki Kx 250 vs Suzuki Rm-z 450

Side-by-side comparison for used motorcycle buyers

Kawasaki Kx 250 vs Suzuki Rm-z 450. Kawasaki Kx 250: Approximately 40–42 hp @ 13,000 rpm (2020+ 4-stroke model; earlier 2-stroke models varied) hp, 110 kg (curb weight, 2020+ model) weight, top speed Approximately 120–130 km/h (estimate; motocross bikes are not optimized for top speed), Motoryk rating 8.2/10. Suzuki Rm-z 450: ~56 hp @ 9,500 rpm (estimated for modern 2018+ spec) hp, 110 kg (wet/curb weight) weight, top speed ~145 km/h (estimated; dependent on gearing and terrain), Motoryk rating 7.8/10.

Performance at a Glance

Green = winner per metric · Bars are relative to the higher value

Kawasaki Kx 250 Suzuki Rm-z 450
Horsepower (hp)
40 hp
56 hp
Torque (Nm)
28 Nm
51 Nm
Top Speed (km/h)
120 km/h
145 km/h
Weight (kg) — lower is better
110 kg
110 kg
Type
Motocross
Motocross
Horsepower
Approximately 40–42 hp @ 13,000 rpm (2020+ 4-stroke model; earlier 2-stroke models varied)
~56 hp @ 9,500 rpm (estimated for modern 2018+ spec)
Torque
Approximately 28–30 Nm @ 10,500 rpm (2020+ 4-stroke model; estimate)
~51 Nm @ 7,500 rpm (estimated)
Top Speed
Approximately 120–130 km/h (estimate; motocross bikes are not optimized for top speed)
~145 km/h (estimated; dependent on gearing and terrain)
Weight
110 kg (curb weight, 2020+ model)
110 kg (wet/curb weight)
Fuel
Estimated 6–8 L/100km (note: varies greatly depending on riding intensity; off-road/motocross use makes precise figures difficult to standardize)
~5.5 L/100km (estimated; highly variable under race/off-road conditions)
Fairing
No
No

Individual Reviews

Kawasaki Kx 250
Kawasaki Kx 250
8.2/10

"Buy it right and you'll grin every single lap."

Pros
+Explosive, rewarding power delivery
+Sharp, responsive chassis
+Strong parts availability
Cons
Punishing for inexperienced riders
Two-stroke maintenance costs pile up
Power valve requires regular attention
Suzuki Rm-z 450
Suzuki Rm-z 450
7.8/10

"Fast, rewarding, but only buy one with full service history."

Pros
+Explosive, confidence-inspiring power
+Excellent factory suspension platform
+Strong parts availability
Cons
Valve maintenance costs add up
Unforgiving for beginners
Thirsty on fuel

Top 10 Accessories

Picks that work on either bike.

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10W-40 2-stroke premix oil
Engine Oil
10W-40 2-stroke premix oil
View on Amazon →
🛢️
Motul · Engine Oil
Motul 7100 10W-40 Synthetic 1L (needs ~1.1L)
View on Amazon →
⚙️
Oil Filter
Oil Filter
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⚙️
HifloFiltro · Oil Filter
HifloFiltro HF139
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🌬️
Twin Air · Air Filter
Twin Air Power Filter
View on Amazon →
🌬️
Air Filter
Foam air filter for Suzuki RM-Z450
View on Amazon →
NGK · Spark Plugs
NGK BR9EG spark plug
View on Amazon →
Spark Plugs
Spark plug for Suzuki RM-Z450
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Full-Face Motorcycle Helmet
Helmet
Full-Face Motorcycle Helmet
View on Amazon →
Riding Gloves
Gloves
Riding Gloves
View on Amazon →
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