Target Audience:
Sport ATV riders, trail riders, and amateur/professional racers seeking a high-performance mid-displacement quad
Segment:
Performance sport ATV class
Key Competitors:
Honda TRX400EX, Yamaha YFZ450, Kawasaki KFX400 (Arctic Cat DVX400 sibling)
Engine Design:
Derived from the Suzuki DR-Z400 engine, proven liquid-cooled 4-stroke design
Handling:
Lightweight chassis with long-travel suspension for motocross and trail use
Reliability:
Reputation as one of the most durable 400-class sport ATVs of its era
Engine:
398cc liquid-cooled DOHC 4-valve single
Suspension:
Fully independent long-travel front A-arms with rear swingarm
Brakes:
Front and rear hydraulic disc brakes
Coverage Areas:
Complete vehicle: engine, fuel, cooling, electrical, chassis, suspension, brakes, driveline, bodywork
Manual Type:
Factory service repair workshop manual
Delivery Method:
Instant digital download
Layout:
Easy-to-follow layout format covering all repair procedures in great detail
Illustrations:
Detailed diagrams and photos supporting each procedure
Intended User:
Professional technicians and DIY owners
Engine:
Complete teardown, inspection, machining limits, and rebuild procedures
Fuel System:
Carburetor disassembly, jetting, fuel tank and petcock service
Cooling System:
Radiator, water pump, thermostat, hoses, and coolant replacement
Lubrication:
Oil system, oil pump, and oil strainer service
Electrical System:
Ignition, charging, starting, lighting, and wiring diagrams
Chassis:
Frame, steering, and suspension component service
Brakes:
Front and rear disc brake pad, caliper, master cylinder, and rotor service
Wheels and Tires:
Wheel removal, inspection, and tire service
Final Drive:
Drive chain and sprocket inspection, adjustment, and replacement
Transmission:
5-speed transmission teardown, inspection, and reassembly
Diagnostics:
Symptom-based troubleshooting charts and electrical fault diagnosis
Scheduled Maintenance:
Complete periodic service procedures and torque specifications
Removal and Installation:
Step-by-step component removal, disassembly, and reassembly
Inspection:
Wear limits and standard service specifications for all major components
Specifications Tables:
Full factory specifications for engine, chassis, and electrical systems
Torque Values:
Fastener torque specifications throughout all chapters
Special Tools:
Special tool references and alternative methods where applicable
Parts Illustrations:
Exploded views identifying component assemblies for accurate parts ordering
Part Numbers:
Factory part number references where listed in the manual
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Type:
4-stroke, liquid-cooled, DOHC single cylinder
Bore x Stroke:
89.0 mm x 64.0 mm
Valvetrain:
DOHC, 4 valves (titanium valves on later years)
Cooling:
Liquid-cooled with radiator and thermostat
Fuel Delivery:
Mikuni BSR carburetor
Fuel Tank Capacity:
Approx. 2.6 gallons (10 liters)
Recommended Fuel:
Unleaded gasoline, 87 octane or higher
Standard Transmission:
5-speed constant mesh, manual clutch
Optional Transmission:
N/A - single transmission option for this model
Clutch:
Wet, multi-plate manual clutch
Gearbox Features:
Wide-ratio gearing suited to trail riding and motocross
Wheelbase:
Approx. 49.0 inches (1,245 mm)
Overall Length:
Approx. 72.0 inches (1,830 mm)
Ground Clearance:
Approx. 10.6 inches (270 mm)
Seat Height:
Approx. 31.5 inches (800 mm)
Curb Weight:
Approx. 388 lbs (176 kg)
Fuel Capacity:
Approx. 2.6 gallons (10 liters)
Brakes:
Hydraulic disc brakes front and rear
Lighting:
Headlight and taillight for visibility
Steering:
Wide handlebar with crossbar pad (accessory)
Foot Protection:
Standard footpegs and rider foot positioning
Fenders:
Full plastic bodywork with fenders for debris protection
Crash Test Rating:
N/A - ATVs are not subject to automotive crash test ratings
Audio System:
N/A - sport ATV, not equipped with audio systems
Ignition System:
Digital CDI ignition for reliable spark delivery
Instrumentation:
Basic indicator lights; no digital display on stock model
Electric Start:
Electric starter with backup recoil start provision
Engine Oil:
Change every 10 operating hours or monthly under hard use
Oil Filter:
Replace with every other oil change
Air Filter:
Clean after every ride in dusty conditions; replace as needed
Valve Clearance:
Check periodically per schedule in manual
Drive Chain:
Inspect, clean, and lubricate before each ride
Engine Oil:
SAE 10W-40 API SF/SG or higher, JASO MA motorcycle oil
Coolant:
High-quality ethylene glycol antifreeze with silicate-free corrosion inhibitors
Known Issues / Common Wear Items
Valve Adjustment:
Frequent valve clearance checks recommended, especially on early models
Cam Chain Tensioner:
Common wear item; inspect for noise and proper adjustment
Carburetor:
Jetting changes recommended for altitude and aftermarket exhaust/intake
Swingarm Bearings:
Grease regularly; common wear point under racing use
Manufacturer:
Suzuki Motor Corporation, Japan
ATV Heritage:
Suzuki pioneered 4-wheel ATVs with the QuadRunner and led the sport ATV segment through the 1980s and 1990s
Debut:
LTZ400 introduced in 2003 as Suzuki's flagship 400-class sport quad
Related Models:
Engine architecture shared with the DR-Z400 motorcycle and Kawasaki KFX400 / Arctic Cat DVX400 (alliance models)
Production Run:
LTZ400 continued in production beyond 2006 with incremental updates
Production Location:
Japan