2003 Suzuki KSF400A Overview, Reviews, Ratings & Specs
The 2003 Suzuki KSF400A, often known as the "Quadzilla" or "KFX400," is a popular sport ATV that was produced from 2003 to 2006. Based on the Kawasaki KFX400 chassis, it shares many components with its sibling. It features a sporty, aggressive body style designed for performance riding. While there weren't distinct trims, its popularity stemmed from its powerful engine and agile handling, making it a favorite among enthusiasts seeking thrills on various terrains. New pricing was generally in the $5,000-$6,000 range.
The Good
The 2003 Suzuki KSF400A boasts strong performance from its capable engine, offering exciting acceleration. Its reliable build provides peace of mind, while the sporty design appeals to the thrill-seeker. For practical buyers, its value proposition is high, offering a potent machine at a competitive price point.
The Bad
Potential owners should watch out for common issues like a weak stock clutch, which may require upgrading for aggressive riding. Some owners have reported carburetor tuning difficulties and occasional electrical gremlins. Overheating can be a concern in demanding conditions if not properly maintained.
2003 Suzuki KSF400A: Quick Overview
- Engine: A liquid-cooled, four-stroke, DOHC, 4-valve, single-cylinder engine.
- Displacement: 398cc.
- Bore x Stroke: 85.0 mm x 70.0 mm.
- Compression Ratio: 11.3:1.
- Fuel System: Mikuni 37mm carburetor.
- Ignition: Electronic ignition.
- Transmission: 5-speed, constant mesh with reverse.
- Clutch: Wet, multi-plate.
- Horsepower: Approximately 42-45 horsepower (estimated, manufacturer figures are often conservative).
- Torque: Around 27-29 lb-ft (estimated).
- 0-60 Times: Not officially published, but estimated to be in the 5-6 second range for spirited acceleration, depending on conditions and rider.
- Top Speed: Estimated around 65-70 mph.
- Fuel Economy: Highly variable based on riding style and terrain, typically ranging from 10-15 MPG.
- Fuel Tank Capacity: Approximately 2.6 gallons (9.9 liters).
- Cooling System: Liquid-cooled.
- Suspension (Front): Independent, double A-arm with adjustable preload and rebound damping, approximately 8.7 inches of travel.
- Suspension (Rear): Swingarm with adjustable preload and rebound damping, approximately 9.1 inches of travel.
- Brakes (Front): Dual hydraulic disc brakes.
- Brakes (Rear): Single hydraulic disc brake.
- Tires (Front): 22 x 7-10.
- Tires (Rear): 20 x 10-9.
- Towing Capacity: ATVs are generally not designed for towing in the traditional sense.
- Ground Clearance: Approximately 9.4 inches.
- Wheelbase: 50.6 inches.
- Dry Weight: Approximately 370 lbs.
- Trim-Level Features: The KSF400A primarily featured a single configuration focused on performance. Key features included aggressive styling, a powerful engine, a 5-speed transmission with reverse, liquid cooling, adjustable suspension, and hydraulic disc brakes.
2003 Suzuki KSF400A Specifications
Vehicle Information
| Year | 2003 |
| Make | Suzuki |
| Model | KSF400A |
| Trim | - |
| Style | - |
| Type | Motorcycle |
| Category | Low Speed Vehicle |
Manufacturing Details
| Made In | Japan |
| Manufacturing City | TOYOKAWA |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | - |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 400-CC |
| Engine Size | 400L |
| Engine Cylinders | - |
| 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 2003 Suzuki KSF400A Have?
The 2003 Suzuki KSF400A, being a shared platform with the Kawasaki KFX400, tends to exhibit similar common issues. One of the most frequently reported problems is the stock clutch's tendency to slip or wear out prematurely, especially under aggressive riding conditions or after modification. Owners often opt for aftermarket clutch upgrades to address this. Another common concern is related to the carburetor; some units may require careful tuning to achieve optimal performance, and older carbs can sometimes suffer from wear and tear leading to jetting issues or fuel delivery problems.
Electrical gremlins, though not overwhelmingly widespread, have been reported. These can range from intermittent headlight issues to problems with the ignition system or charging circuit. Ensuring all connections are clean and secure is crucial for maintaining electrical reliability. Overheating can also become a concern, particularly in high-performance scenarios or during prolonged, demanding rides, especially if the cooling system is not meticulously maintained with clean coolant and a functional radiator fan.
While there haven't been any major, widely publicized recalls for the 2003 model year that significantly impact its long-term reliability, it's always prudent to check with Suzuki or Kawasaki for any specific service bulletins or safety campaigns that may have been issued. Owners who have consistently followed proper maintenance schedules, including regular oil changes, coolant flushes, and air filter cleaning, generally report good long-term reliability. However, neglect of maintenance, particularly with the engine and cooling system, can lead to more significant and costly repairs over time. The overall reliability is considered decent for its class, but proactive maintenance and addressing minor issues before they escalate are key to its longevity.
Electrical gremlins, though not overwhelmingly widespread, have been reported. These can range from intermittent headlight issues to problems with the ignition system or charging circuit. Ensuring all connections are clean and secure is crucial for maintaining electrical reliability. Overheating can also become a concern, particularly in high-performance scenarios or during prolonged, demanding rides, especially if the cooling system is not meticulously maintained with clean coolant and a functional radiator fan.
While there haven't been any major, widely publicized recalls for the 2003 model year that significantly impact its long-term reliability, it's always prudent to check with Suzuki or Kawasaki for any specific service bulletins or safety campaigns that may have been issued. Owners who have consistently followed proper maintenance schedules, including regular oil changes, coolant flushes, and air filter cleaning, generally report good long-term reliability. However, neglect of maintenance, particularly with the engine and cooling system, can lead to more significant and costly repairs over time. The overall reliability is considered decent for its class, but proactive maintenance and addressing minor issues before they escalate are key to its longevity.
How long will the 2003 Suzuki KSF400A last?
Estimating average mileage for an ATV like the 2003 Suzuki KSF400A is challenging as usage varies greatly from occasional trail riding to extensive off-road use. However, well-maintained KSF400As can realistically be expected to provide 5-10 years of service or accumulate well over 10,000 miles if used regularly and cared for. The engine, if properly serviced, is quite durable. Long-term durability is heavily influenced by maintenance; neglected machines can suffer from premature wear on the clutch, transmission, and suspension components. Weaknesses over time can include carburetor issues, potential electrical faults, and the aforementioned clutch wear. With diligent care, however, it can remain a reliable and fun machine for many years.
What Technology & Safety Features are Included?
The 2003 Suzuki KSF400A is a performance-oriented sport ATV, and as such, its focus is on mechanical function rather than advanced technological features. It does not come equipped with any form of built-in entertainment systems like audio players or displays, as these are not relevant to its intended use. Similarly, there are no driver-assistance features such as ABS, traction control, or stability control, which are common in modern vehicles but not typically found on sport ATVs of this era.
Safety features are primarily mechanical. The KSF400A is equipped with a robust braking system, featuring dual hydraulic disc brakes at the front and a single hydraulic disc brake at the rear, providing ample stopping power. The chassis and suspension are designed for stability and control during aggressive riding. It utilizes a rugged steel frame for structural integrity. Lighting is typically a single headlight and a taillight/brake light combination for basic visibility. There are no electronic safety nets or advanced warning systems.
Optional features would generally be aftermarket accessories rather than factory-installed packages. These could include upgraded exhaust systems, performance tuning kits, aftermarket suspension components, handguards for protection, skid plates for underbody protection, and different tire sets for various terrains. Due to its nature as an off-road vehicle, formal crash-test ratings from organizations like NHTSA or IIHS are not applicable or available for the 2003 Suzuki KSF400A. Safety in operation relies heavily on the rider's skill, protective gear, and the inherent mechanical capabilities of the ATV.
Safety features are primarily mechanical. The KSF400A is equipped with a robust braking system, featuring dual hydraulic disc brakes at the front and a single hydraulic disc brake at the rear, providing ample stopping power. The chassis and suspension are designed for stability and control during aggressive riding. It utilizes a rugged steel frame for structural integrity. Lighting is typically a single headlight and a taillight/brake light combination for basic visibility. There are no electronic safety nets or advanced warning systems.
Optional features would generally be aftermarket accessories rather than factory-installed packages. These could include upgraded exhaust systems, performance tuning kits, aftermarket suspension components, handguards for protection, skid plates for underbody protection, and different tire sets for various terrains. Due to its nature as an off-road vehicle, formal crash-test ratings from organizations like NHTSA or IIHS are not applicable or available for the 2003 Suzuki KSF400A. Safety in operation relies heavily on the rider's skill, protective gear, and the inherent mechanical capabilities of the ATV.
What Colors Options are Available?
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2003 Suzuki KSF400A Prices and Market Value
When new, the 2003 Suzuki KSF400A typically retailed between $5,000 and $6,000, positioning it as a competitive option in the sport ATV market. Today, used market prices for a 2003 KSF400A can range significantly, generally from $1,500 to $3,500 or more, depending heavily on its condition, mileage, modifications, and overall maintenance history. This generation of sport ATVs has seen a steady depreciation, but models in excellent, well-maintained original condition can hold their value better than modified or heavily used examples. Factors affecting resale value include the presence of common upgrades (like a better clutch), cosmetic condition, and mechanical soundness. A poorly maintained or heavily abused unit will fetch a much lower price.
2003 Suzuki KSF400A Cost of Ownership
Ownership costs for the 2003 Suzuki KSF400A are generally moderate, making it relatively economical for its performance class. Insurance will vary based on rider age, location, and coverage, but is typically less expensive than for street-legal vehicles. Fuel consumption is moderate, averaging around 10-15 MPG depending on riding style. Routine maintenance, including oil changes, filter cleaning, and chain adjustments, is essential and reasonably priced. Major repairs, such as engine work or clutch replacement, can be more costly, especially if aftermarket performance parts are desired. Overall, it's a moderately priced vehicle to own, with costs primarily driven by maintenance and usage intensity.
2003 Suzuki KSF400A Fuel Efficiency
Fuel Type
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Fuel Capacity
-
City Mileage
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Highway Mileage
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2003 Suzuki KSF400A Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
2003 Suzuki KSF400A Insurance
Insurance for a 2003 Suzuki KSF400A is moderately priced, reflecting its status as a Motorcycle with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 2003 Suzuki KSF400A Compare to Other Motorcycle?
The 2003 Suzuki KSF400A (KFX400) entered a competitive sport ATV segment dominated by its close sibling, the Kawasaki KFX400, and the Yamaha YFZ450. In terms of performance, the KSF400A offered a potent 398cc liquid-cooled engine that provided strong acceleration and ample power for trail riding and recreational racing. It was often seen as a slightly more tractable and forgiving option compared to the more aggressive YFZ450, which boasted a larger 450cc engine.
When stacked against the Yamaha YFZ450, the KSF400A generally produced slightly less peak horsepower but offered a broader, more usable powerband for general trail use. The KSF400A shared its chassis and many mechanical components with the KFX400, making their performance very similar, with minor tuning differences being the primary distinction. In terms of features, all these sport ATVs of the era focused on performance: adjustable suspension, hydraulic disc brakes, and lightweight frames. None offered advanced electronics. The KSF400A, like its Kawasaki counterpart, often came with a slightly less aggressive aesthetic than the YFZ450.
Reliability for the KSF400A and KFX400 is generally considered good, with the main noted weakness being the stock clutch. The YFZ450 also had its own set of potential issues, often related to its high-strung engine. Price-wise, the KSF400A was typically priced competitively, often slightly less than or on par with its Kawasaki sibling and generally more affordable than the YFZ450 when new. In the used market, all have depreciated, but well-maintained KSF400As and KFX400s offer excellent value. If seeking more power out-of-the-box, the Yamaha YFZ450 is a strong alternative, though often more expensive. For a very similar experience with potentially even better parts availability due to its widespread popularity, the Kawasaki KFX400 is a direct and excellent alternative. Other competitors from this era include the Honda TRX400EX, which offered a more utility-focused yet still sporty ride, and the Polaris Predator 500, known for its power but sometimes criticized for handling.
When stacked against the Yamaha YFZ450, the KSF400A generally produced slightly less peak horsepower but offered a broader, more usable powerband for general trail use. The KSF400A shared its chassis and many mechanical components with the KFX400, making their performance very similar, with minor tuning differences being the primary distinction. In terms of features, all these sport ATVs of the era focused on performance: adjustable suspension, hydraulic disc brakes, and lightweight frames. None offered advanced electronics. The KSF400A, like its Kawasaki counterpart, often came with a slightly less aggressive aesthetic than the YFZ450.
Reliability for the KSF400A and KFX400 is generally considered good, with the main noted weakness being the stock clutch. The YFZ450 also had its own set of potential issues, often related to its high-strung engine. Price-wise, the KSF400A was typically priced competitively, often slightly less than or on par with its Kawasaki sibling and generally more affordable than the YFZ450 when new. In the used market, all have depreciated, but well-maintained KSF400As and KFX400s offer excellent value. If seeking more power out-of-the-box, the Yamaha YFZ450 is a strong alternative, though often more expensive. For a very similar experience with potentially even better parts availability due to its widespread popularity, the Kawasaki KFX400 is a direct and excellent alternative. Other competitors from this era include the Honda TRX400EX, which offered a more utility-focused yet still sporty ride, and the Polaris Predator 500, known for its power but sometimes criticized for handling.
Final Verdict: Is the 2003 Suzuki KSF400A a Good Motorcycle?
The 2003 Suzuki KSF400A is ideal for recreational riders and intermediate ATV enthusiasts looking for a capable and exciting sport quad without breaking the bank. It's a great choice for trail riding, recreational dirt track use, and general off-road fun. Given its age, buying new is not an option; therefore, purchasing a well-maintained used KSF400A is where its value lies. It's worth buying if you find one in good condition, ideally with some common upgrades already installed (like a stronger clutch). Be prepared for potential maintenance, especially if the previous owner was hard on it. For its price on the used market, it offers a fantastic blend of performance and agility, making it a smart buy for those seeking thrills on four wheels.
Eugene S
Eugene is an automotive enthusiast with over 15 years of experience in the used car market. As a writer at VINCheck.info, he brings deep industry insight and a passion for cars, helping readers make smart, informed decisions. Eugene has written hundreds of used car reviews and is known for breaking down complex automotive topics into clear, actionable advice. Over the years, he has driven and worked on a wide range of vehicles—starting with tuning street cars in his early days and eventually focusing on performance upgrades and reliability improvements. Today, he specializes in evaluating used vehicles through the lens of real-world ownership and enthusiast needs. A longtime fan of Porsche, Eugene especially appreciates vehicles that blend durability with driving enjoyment.