Kawasaki Zx-25r vs Kawasaki Ninja Zx-6r 636
Side-by-side comparison for used motorcycle buyers
Kawasaki Zx-25r vs Kawasaki Ninja Zx-6r 636. Kawasaki Zx-25r: 45 hp @ 15,500 rpm hp, 183 kg (wet/curb weight) weight, top speed ~185 km/h (estimated; some sources report up to 190 km/h), Motoryk rating 8.5/10. Kawasaki Ninja Zx-6r 636: 128 hp @ 13,500 rpm hp, 194 kg (wet/curb weight) weight, top speed 255 km/h, Motoryk rating 8.5/10.
Performance at a Glance
Green = winner per metric · Bars are relative to the higher value
Kawasaki Zx-25r
Kawasaki Ninja Zx-6r 636
Horsepower (hp)
45 hp
128 hp
Torque (Nm)
21.7 Nm
70.8 Nm
Top Speed (km/h)
185 km/h
255 km/h
Weight (kg) — lower is better
183 kg
194 kg
Type
Supersport
Supersport
Horsepower
45 hp @ 15,500 rpm
128 hp @ 13,500 rpm
Torque
21.7 Nm @ 13,000 rpm
70.8 Nm @ 11,500 rpm
Top Speed
~185 km/h (estimated; some sources report up to 190 km/h)
255 km/h
Weight
183 kg (wet/curb weight)
194 kg (wet/curb weight)
Fuel
~5.5 L/100km (approximately 18 km/L, real-world estimate)
6.5 L/100km (approximately 15.4 km/L, real-world average)
Fairing
Yes
Yes
Individual Reviews
Kawasaki Zx-25r
8.5/10
"The most addictive 250 ever built, buy it without hesitation."
Pros
+Screaming inline-four exhaust note
+Razor-sharp chassis and handling
+Incredible mechanical novelty factor
Cons
−Expensive valve clearance checks
−Needs constant high revs
−Limited low-end torque
Kawasaki Ninja Zx-6r 636
8.5/10
"The smartest 600-class buy if you find a clean one."
Pros
+Exceptional midrange for class
+Rock-solid Kawasaki reliability
+Scalpel-precise chassis feel
Cons
−Aggressive ergonomics hurt daily
−Valve checks frequently skipped
−Older models lack modern aids
Top 10 Accessories
Picks that work on either bike.
