The 2021 Kawasaki EX400, widely known as the Ninja 400, is a lightweight sportbike that succeeded the popular Ninja 300 in 2018. Featuring a full-fairing body style, it appeals to both new and experienced riders. Available trims include the standard model and the KRT Edition, with new pricing typically ranging from approximately $5,299 to $5,899. Its popularity stems from its approachable yet exciting power delivery, sharp handling, and aggressive Ninja styling, making it an excellent all-rounder.
The Good
The 2021 Kawasaki EX400 boasts spirited performance from its parallel-twin engine, combined with nimble handling for an exhilarating ride that appeals to emotional buyers. Its renowned Kawasaki reliability ensures peace of mind for practical owners. The design is aggressively sporty, while good fuel efficiency and comfortable ergonomics make it practical for daily commutes. Excellent value for money means a powerful, stylish, and dependable bike without a premium price tag.
The Bad
Known weaknesses for the 2021 Kawasaki EX400 primarily include its basic, non-adjustable stock front suspension, which can feel soft for aggressive riding or heavier riders. The seat can become firm on longer journeys, impacting comfort. While adequate, the brakes are not top-tier, and some find the overall build quality of certain plastic components slightly less premium than expected. Watch out for these areas if you plan extensive touring or track use without upgrades.
2021 Kawasaki EX400: Quick Overview
- Engine: The 2021 Kawasaki EX400 is powered by a single engine option: a 399cc, liquid-cooled, 4-stroke, DOHC, 8-valve parallel-twin engine. This compact and efficient powerplant is known for its smooth power delivery and broad torque curve, making it accessible for various skill levels.
- Horsepower: The engine typically produces around 44-49 horsepower at the crank, translating to approximately 40-45 horsepower at the rear wheel. This power output provides lively acceleration without being overwhelming, distinguishing it from smaller displacement rivals.
- Fuel Economy: Riders can expect excellent fuel economy, with averages often ranging from 50 to 60 miles per gallon (MPG) depending on riding style and conditions. This contributes significantly to its low running costs.
- 0-60 MPH Times: The Ninja 400 can accelerate from 0 to 60 MPH in an impressive time, typically estimated between 4.2 to 4.5 seconds. This quick sprint time highlights its sporty character and ability to keep up with traffic or offer spirited riding.
- Towing Capacity: As a sport motorcycle, the 2021 Kawasaki EX400 does not have any rated towing capacity. It is not designed or intended for towing purposes.
- Trim-Level Features:
- Standard Model: Features include a multi-function LCD screen combined with an analog tachometer, an assist & slipper clutch for lighter lever pull and reduced wheel hop during aggressive downshifts, disc brakes on both front and rear, and LED taillights.
- ABS Model: The optional Anti-lock Brake System (ABS) enhances safety by preventing wheel lock-up during hard braking, especially in adverse conditions. This is a highly recommended upgrade for many riders.
- KRT Edition (Kawasaki Racing Team): This trim offers special Kawasaki Racing Team graphics and colors, mimicking the factory race bikes. Functionally, it is identical to the standard or ABS model, but it provides a distinctive aesthetic appeal for enthusiasts.
2021 Kawasaki EX400 Specifications
Vehicle Information
| Year | 2021 |
| Make | Kawasaki |
| Model | EX400 |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Motorcycle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | AMPHUR PLUAK DAENG |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 399CC |
| Engine Size | 399L |
| Engine Cylinders | 2 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 2021 Kawasaki EX400 Have?
The 2021 Kawasaki EX400 (Ninja 400) has a strong reputation for reliability, carrying on Kawasaki's legacy of building dependable motorcycles. Compared to many vehicles, frequently reported problems are quite minimal, a testament to its refined design. However, some common owner observations include the stock suspension being quite basic and soft, particularly the front forks. This can lead to a less composed ride under aggressive braking or on rougher roads, prompting some owners to explore aftermarket suspension upgrades. Another minor point is the firmness of the seat, which can become uncomfortable on long rides, leading some to invest in custom seats or seat pads for improved touring comfort. There are also occasional mentions of minor vibrations at certain RPMs, but these are generally not considered problematic or indicative of a fault.
Regarding recalls, the 2021 model year has been relatively clear of widespread, significant issues. Earlier model years, specifically some 2018-2020 Ninja 400s, had a recall related to the rear brake master cylinder and, in rare instances, issues with certain fasteners, but these were typically addressed and not prevalent on the 2021 iteration. Always check the National Highway Traffic Safety Administration (NHTSA) database for the most up-to-date information on any potential recalls specific to your VIN.
Long-term reliability concerns for the Ninja 400 are generally low. The parallel-twin engine is robust and well-engineered, with many owners reporting high mileage without major mechanical failures when routine maintenance schedules are followed. The transmission is also durable. The main long-term considerations are typical wear items such as chains, sprockets, tires, and brake pads. Proper maintenance, including regular oil changes, chain adjustments, and adhering to valve clearance checks at the specified intervals, will ensure a long and trouble-free ownership experience. Overall, it's considered a very reliable machine that holds up well over time.
Regarding recalls, the 2021 model year has been relatively clear of widespread, significant issues. Earlier model years, specifically some 2018-2020 Ninja 400s, had a recall related to the rear brake master cylinder and, in rare instances, issues with certain fasteners, but these were typically addressed and not prevalent on the 2021 iteration. Always check the National Highway Traffic Safety Administration (NHTSA) database for the most up-to-date information on any potential recalls specific to your VIN.
Long-term reliability concerns for the Ninja 400 are generally low. The parallel-twin engine is robust and well-engineered, with many owners reporting high mileage without major mechanical failures when routine maintenance schedules are followed. The transmission is also durable. The main long-term considerations are typical wear items such as chains, sprockets, tires, and brake pads. Proper maintenance, including regular oil changes, chain adjustments, and adhering to valve clearance checks at the specified intervals, will ensure a long and trouble-free ownership experience. Overall, it's considered a very reliable machine that holds up well over time.
How long will the 2021 Kawasaki EX400 last?
With diligent maintenance, a 2021 Kawasaki EX400 can easily achieve 50,000 to 70,000 miles, and many dedicated owners report exceeding 80,000 miles, translating to 10-15+ years of service. Its long-term durability is a significant strong point. The 399cc parallel-twin engine is remarkably robust and known to withstand high mileage, as is the transmission. The frame and essential components are well-built and resistant to premature wear.
Weaknesses over time are typically confined to consumable parts. Suspension components, particularly the rear shock, may begin to feel less effective after significant mileage, prompting replacement or upgrade. Cosmetic plastics can show signs of age or sun fading if not cared for. Electrical systems are generally reliable, but routine checks on connections and wiring are always prudent. Adhering to the manufacturer's maintenance schedule, especially valve clearance checks, is paramount for ensuring the engine's extended lifespan.
Weaknesses over time are typically confined to consumable parts. Suspension components, particularly the rear shock, may begin to feel less effective after significant mileage, prompting replacement or upgrade. Cosmetic plastics can show signs of age or sun fading if not cared for. Electrical systems are generally reliable, but routine checks on connections and wiring are always prudent. Adhering to the manufacturer's maintenance schedule, especially valve clearance checks, is paramount for ensuring the engine's extended lifespan.
What Technology & Safety Features are Included?
The 2021 Kawasaki EX400 (Ninja 400) offers a blend of essential technology and practical safety features, fitting its role as an approachable sportbike. For built-in tech, the motorcycle features a modern instrument cluster that combines an analog tachometer for a traditional sportbike feel with a multi-function LCD screen. This digital display provides crucial information such as a speedometer, odometer, dual trip meters, fuel gauge, clock, gear position indicator, ABS indicator (if equipped), and an economy riding indicator to help riders maximize fuel efficiency. There are no built-in entertainment systems, as is standard for sport motorcycles, focusing instead on the riding experience.
Driver-assistance features are primarily focused on enhancing rideability and control. The most notable is the Assist & Slipper clutch. The "assist" function provides a lighter clutch lever pull, reducing rider fatigue, especially in stop-and-go traffic. The "slipper" function helps prevent rear-wheel hop and chatter during aggressive downshifts, providing smoother deceleration and greater stability. This is a significant advantage, particularly for newer riders or those pushing the bike's limits.
Safety features include powerful front and rear disc brakes, which offer confident stopping power. An Anti-lock Brake System (ABS) is available as an optional feature. ABS is a crucial safety enhancement, preventing the wheels from locking up under hard braking or on slippery surfaces, thereby maintaining steering control and reducing the risk of a fall. The Ninja 400 also features an LED taillight for enhanced visibility from the rear, and its relatively upright riding position compared to more aggressive sportbikes allows for good forward visibility for the rider.
Regarding crash-test ratings, motorcycles are not subjected to the same standardized crash-test ratings (like NHTSA or IIHS) as automobiles. Motorcycle safety largely relies on rider skill, protective gear, and the inherent stability and braking capabilities of the bike, all of which the Ninja 400 performs competently in its class. The optional ABS is the primary active safety technology designed to prevent accidents.
Driver-assistance features are primarily focused on enhancing rideability and control. The most notable is the Assist & Slipper clutch. The "assist" function provides a lighter clutch lever pull, reducing rider fatigue, especially in stop-and-go traffic. The "slipper" function helps prevent rear-wheel hop and chatter during aggressive downshifts, providing smoother deceleration and greater stability. This is a significant advantage, particularly for newer riders or those pushing the bike's limits.
Safety features include powerful front and rear disc brakes, which offer confident stopping power. An Anti-lock Brake System (ABS) is available as an optional feature. ABS is a crucial safety enhancement, preventing the wheels from locking up under hard braking or on slippery surfaces, thereby maintaining steering control and reducing the risk of a fall. The Ninja 400 also features an LED taillight for enhanced visibility from the rear, and its relatively upright riding position compared to more aggressive sportbikes allows for good forward visibility for the rider.
Regarding crash-test ratings, motorcycles are not subjected to the same standardized crash-test ratings (like NHTSA or IIHS) as automobiles. Motorcycle safety largely relies on rider skill, protective gear, and the inherent stability and braking capabilities of the bike, all of which the Ninja 400 performs competently in its class. The optional ABS is the primary active safety technology designed to prevent accidents.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
2021 Kawasaki EX400 Prices and Market Value
When new, the 2021 Kawasaki EX400 (Ninja 400) had an MSRP of approximately $5,299 for the non-ABS model and $5,699 for the ABS-equipped version, with the KRT Edition typically adding a couple of hundred dollars. In the current used market (2024), well-maintained 2021 models typically sell for about $4,000 to $5,500, depending heavily on mileage, condition, and the presence of ABS or KRT livery.
The Ninja 400 demonstrates excellent depreciation insights; it holds its value remarkably well within the entry-level sportbike segment. Factors affecting resale value include the overall cosmetic and mechanical condition, low mileage, the presence of ABS, and a clean title. Original KRT Edition models can also command a slight premium due to their distinctive graphics. Aftermarket modifications can sometimes negatively impact resale if not tastefully done or if they suggest hard use.
The Ninja 400 demonstrates excellent depreciation insights; it holds its value remarkably well within the entry-level sportbike segment. Factors affecting resale value include the overall cosmetic and mechanical condition, low mileage, the presence of ABS, and a clean title. Original KRT Edition models can also command a slight premium due to their distinctive graphics. Aftermarket modifications can sometimes negatively impact resale if not tastefully done or if they suggest hard use.
2021 Kawasaki EX400 Cost of Ownership
The 2021 Kawasaki EX400 is notably economical to own, making it a popular choice. Insurance costs are generally affordable, particularly for experienced riders, though new riders might face higher premiums. Fuel efficiency is a major highlight, with 50-60 MPG common, leading to low fuel expenses. Maintenance is reasonable; standard service intervals are manageable, and parts are readily available and not overly expensive. Major services, like valve clearance checks, are less frequent but crucial. Repairs are typically straightforward given its relatively simple design, and parts are widely available. Overall, its low running costs for insurance, fuel, and maintenance firmly establish it as an economical vehicle to own and operate long-term.
2021 Kawasaki EX400 Fuel Efficiency
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Gasoline
Fuel Capacity
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Highway Mileage
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2021 Kawasaki EX400 Warranty
Basic
Original warranty
0 months / No data
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Expired
Powertrain
Original warranty
0 months / No data
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Expired
Rust
Original warranty
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2021 Kawasaki EX400 Insurance
Insurance for a 2021 Kawasaki EX400 is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2021 Kawasaki EX400 Compare to Other Motorcycle?
The 2021 Kawasaki EX400 (Ninja 400) stands out strongly in the competitive small-displacement sportbike segment, often going head-to-head with rivals like the Yamaha YZF-R3, Honda CBR300R (and CBR500R), KTM RC390, and Suzuki GSX250R.
In terms of Performance, the Ninja 400 typically has a slight edge in horsepower and torque over the Yamaha R3 and a significant advantage over the Honda CBR300R and Suzuki GSX250R. Its 399cc engine feels more potent and refined than its 300-320cc Japanese counterparts, offering a broader powerband and more exhilarating acceleration. The KTM RC390, while similar in displacement, often feels more aggressive and track-focused with its single-cylinder engine, but it can also be less refined for daily riding.
For Features, the Ninja 400's standout is its Assist & Slipper clutch, which offers a lighter lever pull and prevents rear-wheel lock-up during downshifts – a feature not always standard on rivals. All competitors generally offer optional ABS and similar digital/analog dash displays. The Ninja 400's ergonomics strike a good balance between sportiness and comfort, often perceived as more comfortable than the more aggressive KTM RC390.
Reliability is a strong suit for the Japanese contenders. The Kawasaki Ninja 400, Yamaha R3, and Honda CBR300R/500R are all renowned for their bulletproof reliability and low maintenance requirements. The KTM RC390, while exciting, has historically had a reputation for being slightly less reliable and more prone to minor issues than its Japanese rivals.
When it comes to Price, the Ninja 400 is very competitively positioned. It often offers a superior performance package for a price point that is very close to, or even slightly below, some of its less powerful competitors, offering excellent value.
Recommended Alternatives:
The 2021 Kawasaki EX400 generally provides the best blend of performance, modern features, unquestionable reliability, and strong value in its class.
In terms of Performance, the Ninja 400 typically has a slight edge in horsepower and torque over the Yamaha R3 and a significant advantage over the Honda CBR300R and Suzuki GSX250R. Its 399cc engine feels more potent and refined than its 300-320cc Japanese counterparts, offering a broader powerband and more exhilarating acceleration. The KTM RC390, while similar in displacement, often feels more aggressive and track-focused with its single-cylinder engine, but it can also be less refined for daily riding.
For Features, the Ninja 400's standout is its Assist & Slipper clutch, which offers a lighter lever pull and prevents rear-wheel lock-up during downshifts – a feature not always standard on rivals. All competitors generally offer optional ABS and similar digital/analog dash displays. The Ninja 400's ergonomics strike a good balance between sportiness and comfort, often perceived as more comfortable than the more aggressive KTM RC390.
Reliability is a strong suit for the Japanese contenders. The Kawasaki Ninja 400, Yamaha R3, and Honda CBR300R/500R are all renowned for their bulletproof reliability and low maintenance requirements. The KTM RC390, while exciting, has historically had a reputation for being slightly less reliable and more prone to minor issues than its Japanese rivals.
When it comes to Price, the Ninja 400 is very competitively positioned. It often offers a superior performance package for a price point that is very close to, or even slightly below, some of its less powerful competitors, offering excellent value.
Recommended Alternatives:
- For more aggressive, track-oriented riding: The KTM RC390 offers sharper handling and a more raw feel, but potentially at the cost of long-term reliability and comfort.
- For absolute beginner-friendliness and even lower running costs: The Yamaha YZF-R3 or Honda CBR300R are still excellent choices, though with slightly less power.
- For a more comfortable daily commuter with slightly more torque: The Honda CBR500R, while a bit heavier and often more expensive, offers a more relaxed ride with a noticeable bump in low-end grunt.
The 2021 Kawasaki EX400 generally provides the best blend of performance, modern features, unquestionable reliability, and strong value in its class.
Final Verdict: Is the 2021 Kawasaki EX400 a Good Motorcycle?
The 2021 Kawasaki EX400 (Ninja 400) is an outstanding motorcycle ideal for a broad range of riders. It's perfect for new riders seeking an approachable yet exciting first sportbike, thanks to its manageable power, light weight, and rider-friendly Assist & Slipper clutch. Intermediate riders will appreciate its nimble handling and spirited engine for canyon carving or track days. Commuters benefit from its excellent fuel economy and comfortable-for-a-sportbike ergonomics. For these reasons, it is absolutely worth buying.
Considering conditions, buying new offers peace of mind with a full warranty. However, purchasing a used model often represents exceptional value due to its strong resale value and robust reliability. Always prioritize models with optional ABS for enhanced safety. The KRT Edition adds aesthetic flair but doesn't alter performance. Ultimately, the Ninja 400 delivers a fantastic, fun, and reliable riding experience without a hefty premium, making it a top recommendation in its segment for virtually anyone seeking an exciting and practical sportbike.
Considering conditions, buying new offers peace of mind with a full warranty. However, purchasing a used model often represents exceptional value due to its strong resale value and robust reliability. Always prioritize models with optional ABS for enhanced safety. The KRT Edition adds aesthetic flair but doesn't alter performance. Ultimately, the Ninja 400 delivers a fantastic, fun, and reliable riding experience without a hefty premium, making it a top recommendation in its segment for virtually anyone seeking an exciting and practical sportbike.
Cathleen V
Cathleen is an exceptional freelance writer covering hot topics in the automotive world from a gearhead's perspective. Her articles delve into various aspects of automotive technology and history, offering readers detailed insights into engine performance, reliability, and maintenance. Through her engaging and informative writing, Cathleen provides valuable information to automotive enthusiasts and consumers alike, helping them make informed decisions about vehicle maintenance and purchases.