Kawasaki Ninja Zx-4r
The Kawasaki Ninja Zx-4r has a top speed of 200 km/h (estimated; approximately 185-200 km/h real-world), produces 77 hp and weighs 187 kg. Motoryk rates it 8.5/10.
The Kawasaki Ninja ZX-4R was revived in 2023 after a long absence, originally having roots in the late 1980s small-displacement sportbike era. The 2023 model was introduced as a modern inline four-cylinder 400cc sportbike, filling a niche between the ZX-25R and larger litre-class machines, targeting riders seeking a high-revving, accessible performance machine. It quickly gained attention for offering a genuine four-cylinder supersport experience at a middleweight price point, making it notable in markets worldwide including the US where the original never officially sold.
77 hp
Power
37.2 Nm
Torque
187 kg
Weight
200 km/h (estimated; approximately 185-200 km/h real-world)
Top Speed
5.5 L/100km (approximately 18.2 km/L, typical real-world average)
Fuel
Faired
Body
Video Review
What Buyers Should Know
Rare 4-Cylinder 400cc
The ZX-4R is one of the only modern 400cc inline-four sport bikes available, making it unique in its class. This engine configuration delivers a high-revving, engaging ride that most competitors simply can't match.
Strong Resale Value
Due to its niche appeal and limited production numbers, the ZX-4R holds its value exceptionally well compared to similar displacement bikes. High demand and low supply mean used examples rarely sell at a significant discount.
Watch Valve Clearances
Like most high-revving inline-four engines, the ZX-4R requires diligent valve clearance checks per Kawasaki's service intervals to avoid performance issues. Skipping this maintenance is the most common mistake owners make and can lead to costly repairs.
Generations & Specs by Year
Original ZX-4R with 398cc inline-four, liquid-cooled engine producing around 59hp, sporty bodywork.
"Japan's forgotten gem that deserves far more respect."
I put nearly 8,000 miles on a '87 ZX-4R and that inline-four is genuinely addictive — it pulls hard past 9,000 rpm and screams toward 12,000 like something twice the displacement. The handling is razor-sharp for a mid-80s bike; 168 kg feels lighter than it reads, and you can hustle it through tight mountain roads with real confidence. That said, below 7,000 rpm it's gutless and sluggish, which makes city commuting a genuine chore unless you're constantly blipping and downshifting to stay in the powerband. Parts availability is the real killer in 2024 — finding OEM gaskets or carb jets means haunting eBay Japan for weeks.
Pros
Cons
Revived ZX-4RR with 399cc inline-four, 77hp, twin exhaust, modern electronics, Sugomi styling.
Used Buyer Review
"The best small-bore inline-four you can buy right now."
$7,500-$10,500 usedThe ZX-4R is genuinely one of the most exciting small-displacement bikes Kawasaki has built in years, and the used market is starting to make sense financially. That inline-four screamer revving to 17,000rpm delivers a hit that'll embarrass plenty of middleweight twins when you're in the upper half of the rev range. First-year examples (2023) occasionally show up with throttle-by-wire glitches and some owners reported rough idle behavior cold — worth checking on any used example you inspect. Practically speaking, these things have been thrashed. Most ZX-4R owners bought them specifically to push limits, so inspect brake pads, chain wear, and look underneath for fairing rash religiously. The quickshifter on base models is an optional extra, so confirm what spec you're actually buying. Service intervals are tighter than a 600, and valve clearance checks aren't cheap. That said, if the mechanicals are solid, you're getting a chassis that genuinely communicates, suspension that's adjustable and capable, and a soundtrack that makes riding genuinely addictive again. Worth every cent of a clean example.
Top 10 Accessories
Curated picks for the Kawasaki Ninja Zx-4r — owned, ridden, recommended.
Common Problems
🔥 1 CRITICALCheck battery voltage at idle and high RPM
Listen for uneven idle, ask about last service
Inspect below engine for coolant staining or residue
✅Pre-Purchase Checklist
Generally solid but needs attentive maintenance
Full Specifications
Rivals & Alternatives
Bikes that buyers cross-shop with the Kawasaki Ninja Zx-4r
Honda Cbr250rr
Cfmoto 450sr
Honda Cbr400rr
Honda Nsr250r
Kawasaki Zx-25r
Compare Kawasaki Ninja Zx-4r Side-by-Side
compare_arrowsSpecs, power, weight & buyer verdict — head-to-head with the bikes most often cross-shopped.
Kawasaki Ninja Zx-4r vs Honda Cbr250rr
Specs · Power · Buyer verdict
Kawasaki Ninja Zx-4r vs Cfmoto 450sr
Specs · Power · Buyer verdict
Kawasaki Ninja Zx-4r vs Honda Cbr400rr
Specs · Power · Buyer verdict
Kawasaki Ninja Zx-4r vs Honda Nsr250r
Specs · Power · Buyer verdict
Kawasaki Ninja Zx-4r vs Kawasaki Zx-25r
Specs · Power · Buyer verdict
More Kawasaki Ninja Zx-4r Guides
More from Kawasaki
View all Kawasaki models →Community Reviews
Discussion
Frequently Asked Questions
What are common problems with the Kawasaki Ninja Zx-4r? +
Stator/charging system failure under hard use: Check battery voltage at idle and high RPM (serious) | Throttle body sync issues causing rough idle: Listen for uneven idle, ask about last service (moderate) | Coolant leaks from water pump seal: Inspect below engine for coolant staining or residue (moderate)
Is the Kawasaki Ninja Zx-4r a good motorcycle? +
The best small-bore inline-four you can buy right now. Rating: 8.5/10. Best for: Experienced riders wanting affordable track-day excitement. Avoid if: New riders or anyone wanting comfortable touring.
What is the horsepower of the Kawasaki Ninja Zx-4r? +
The Kawasaki Ninja Zx-4r produces 77 hp @ 14,500 rpm, with 37.2 Nm @ 13,000 rpm of torque. Top speed: 200 km/h (estimated; approximately 185-200 km/h real-world).
Is the Kawasaki Ninja Zx-4r good for beginners? +
Not really — the Kawasaki Ninja Zx-4r is better for experienced riders. Experienced riders wanting affordable track-day excitement Avoid if: New riders or anyone wanting comfortable touring
Is the Kawasaki Ninja Zx-4r reliable? +
Owners report 1 critical issue to watch for on the Kawasaki Ninja Zx-4r, notably: Stator/charging system failure under hard use (Check battery voltage at idle and high RPM). Buy with a pre-purchase inspection.
Is the Kawasaki Ninja Zx-4r good for daily use? +
Experienced riders wanting affordable track-day excitement Fuel: 5.5 L/100km (approximately 18.2 km/L, typical real-world average).
How fast is the Kawasaki Ninja Zx-4r? +
The Kawasaki Ninja Zx-4r reaches a top speed of 200 km/h (estimated; approximately 185-200 km/h real-world), producing 77 hp at 187 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.
What gear should I buy for a Kawasaki Ninja Zx-4r? +
Motoryk has curated a Top 10 gear list specifically for the Kawasaki Ninja Zx-4r, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/kawasaki/ninja-zx-4r/top10. Each pick is matched to this bike's spec.
