The 2025 Suzuki KingQuad 400ASi is a mid-size utility ATV designed with mechanical simplicity and functional engineering. Built for consistency across multiple applications, this model integrates key upgrades in power delivery, driveline control, suspension geometry, and operational systems. Suzuki's design supports general utility, land management, and light off-road traversal, with features that support both operator control and platform longevity.
Engine and Fuel System Configuration
The 2025 Suzuki KingQuad 400ASi uses a 376cc, single-cylinder, air-cooled, four-stroke engine configured with an overhead camshaft and a wet sump lubrication system. Bore and stroke are measured at 82.0 mm by 71.2 mm, respectively, while the compression ratio is set at 9.0:1.
Fuel delivery is electronically managed through a Suzuki EFI system, which regulates air-fuel mixture based on real-time conditions such as altitude, temperature, and engine load. An electric starter initiates engine ignition, supported by an onboard 12V electrical system. The exhaust system includes a spark-arrestor-equipped muffler suitable for operation on regulated public lands.
Automatic Transmission and Driveline Selection
The vehicle is equipped with a continuously variable transmission (CVT) utilizing a V-belt mechanism with centrifugal clutch engagement. The system includes selectable high-range, low-range, and reverse gears. The centrifugal clutch simplifies takeoff by automatically engaging and disengaging based on engine speed and load conditions.
Driveline configuration is selectable between two-wheel drive and four-wheel drive modes via a manual lever located on the right-side panel. In 2WD mode, the vehicle operates with reduced rolling resistance, conserving fuel and lowering front-axle wear. 4WD mode engages the front differential for improved traction on uneven or loose surfaces. Final power delivery is conducted through a shaft drive system, selected for its enclosed configuration and reduced maintenance demands compared to chain-based alternatives.
Suspension Travel and Geometry
The front suspension consists of an independent double wishbone arrangement utilizing coil springs and oil-damped shock absorbers.
The rear uses a swingarm suspension design that also offers 6.7 inches of travel. Suspension damping is tuned for utility-grade compliance rather than high-speed recreational performance, reducing chassis bounce under slow-speed maneuvering or when carrying gear.
Braking and Tire Specifications
Stopping capability is provided through a dual hydraulic disc brake system on the front wheels. These twin rotors are actuated through a handlebar-mounted control. At the rear, a sealed drum brake provides additional stopping power and is engineered to resist water and particulate ingress.
Tires are AT-rated tubeless types, with dimensions of 25x8-12 at the front and 25x10-12 at the rear. The wider rear tires increase ground contact area for improved traction. The 12-inch steel wheels maintain structural integrity under low tire pressure conditions and are compatible with various terrain-specific tread options for aftermarket customization.
Platform Dimensions and Ergonomics
The chassis measures 81.1 inches in overall length, 45.1 inches in width, and 48.0 inches in height. The wheelbase spans 50.0 inches, providing a balanced platform for both maneuverability and load stability. Ground clearance is measured at 9.8 inches.
Seat height is set at 33.1 inches, supporting an upright rider posture and unobstructed foot movement. The curb weight of 628 pounds includes all fluids and a full fuel tank, ensuring that test figures align with real-world operating conditions. The fuel tank capacity is 4.2 gallons (16.0 liters), enabling extended operation intervals without refueling.
Instrumentation and Electrical Components
The digital instrumentation cluster includes a speedometer, odometer, trip meter, hour meter, clock, and fuel gauge. Status indicators for neutral, reverse, oil pressure, and fuel injection diagnostics are integrated into the display to provide essential operational data without the need for external diagnostic equipment.
Lighting systems include dual 35-watt headlights with high and low beam functions. These are integrated into the front fenders and remain protected from branch or debris impact. At the rear, a 21/5-watt combination taillight provides visibility for follow-on riders and supports safe low-light operation. An integrated 12V DC power outlet is positioned on the front fender for charging devices or powering auxiliary equipment.
Cargo and Utility Integration
The 2025 Suzuki KingQuad 400ASi includes front and rear steel cargo racks coated in a textured wrinkle-paint finish to improve resistance to abrasion and corrosion.
Full floorboards protect the rider’s feet from debris while riding and incorporate integrated footpegs that help maintain control during uneven traversal. The footboards feature raised sections for improved traction in wet or muddy conditions. The seat follows a T-shaped profile, selected for mobility and unrestricted lateral movement.
Winch and Accessory Compatibility
Pre-mounted winch brackets and integrated wiring conduits simplify installation of electric winch systems. The electrical system supports the amperage load required for most 12V winch models in the mid-duty class.
Schedule a Test Ride Today
The 2025 Suzuki KingQuad 400ASi is engineered for functional operation across a range of working environments. Its drivetrain, suspension, and electrical systems are tailored for stability, ease of use, and service simplicity. To evaluate the vehicle’s handling characteristics and functional performance in person, contact Stubbs Cycles near Bay Area Houston, TX. Schedule a test ride today and assess the operational fit of the 2025 Suzuki KingQuad 400ASi for your property or project requirements.