Positioning:
The Suzuki LT-Z90 QuadSport was positioned as an accessible and capable sport ATV for younger riders, offering a step up in performance and handling from smaller beginner models.
Competitors:
Competed with models like the Polaris Sportsman 90, Arctic Cat DVX 90, and Yamaha Raptor 90 (though the Raptor 90 came slightly later, it represents a similar segment).
Features:
Sporty styling, automatic transmission, electric start, reliable air-cooled engine, adjustable throttle limiter for parental control, low seat height for rider confidence.
Value:
This manual provides the necessary technical information to perform maintenance, diagnose issues, and execute repairs, significantly reducing reliance on costly professional services and extending the life of the ATV.
Engine:
Complete overhaul, diagnostics, tuning
Transmission:
Clutch, gearbox operation, maintenance
Chassis:
Frame, suspension, steering, wheels, tires
Electrical System:
Ignition, lighting, charging, wiring diagrams
Brakes:
Hydraulic system, pad replacement, bleeding
Fuel System:
Carburetor, fuel lines, tank
Cooling System:
Air-cooling system (fins, airflow)
Bodywork:
Fenders, plastic panels, seating
Troubleshooting:
Diagnostic procedures, common faults
Estimated Pages:
Approx. 250-350 pages (typical for a comprehensive service manual of this era and scope)
Type:
Service and Repair Manual
Format:
PDF (Downloadable)
Powertrain:
Engine, transmission, drive system
Chassis And Suspension:
Frame, front and rear suspension, steering system, wheel hubs, axle components
Braking System:
Front and rear brake assemblies, hydraulic lines, master cylinders, calipers
Fuel And Exhaust:
Fuel tank, fuel line, carburetor, exhaust system
Electrical And Ignition:
Battery, charging system (stator, regulator/rectifier), ignition system (CDI, spark plug), lighting system, starter motor, switches, wiring harnesses
Controls:
Throttle controls, brake levers, parking brake
Routine Maintenance:
Oil changes, filter replacements, spark plug checks, chain adjustments, tire pressure checks, brake adjustments
Disassembly And Assembly:
Complete component removal and reinstallation procedures for all major systems
Diagnostic Procedures:
Step-by-step troubleshooting guides for common and uncommon issues
Repair And Rebuild:
Detailed instructions for engine internal repairs, carburetor overhaul, transmission service, suspension component replacement
Electrical Troubleshooting:
Use of wiring diagrams, testing electrical components, diagnosing short circuits and open circuits
Depth:
Comprehensive, suitable for home mechanics to professional technicians. Covers basic maintenance to full engine rebuilds and advanced electrical diagnostics.
Engine Type:
Four-stroke, SOHC, Air-Cooled
Bore X Stroke:
47.0 x 51.8 mm
Valve Train:
Single Overhead Camshaft (SOHC), 2 valves
Horsepower Estimate:
Approx. 6.5 - 7.5 HP (specific factory figures are often not published for youth ATVs, but based on displacement and design)
Torque Estimate:
Approx. 7.0 - 8.0 Nm (specific factory figures are often not published)
Carburetor Type:
Mikuni VM17 (or similar small bore constant velocity carb)
Fuel Delivery:
Gravity Feed
Fuel Type:
Unleaded gasoline (87 octane or higher recommended)
Fuel Tank Capacity:
2.4 L (0.6 US gal)
Oil Type:
SAE 10W-40 API SG or higher
Oil Capacity:
Approx. 0.8 L (0.85 US qt) when filter is changed
Atv Safety Standards:
Designed to meet current ANSI standards for recreational off-highway vehicles.
Throttle Limiter:
Adjustable throttle stop screw for parental control over speed.
Parking Brake:
Mechanical parking brake on rear caliper.
Handlebars:
Tapered handlebars with protective padding.
Footwells:
Full floorboards with heel guards for foot protection.
Lighting:
Headlights, taillight/brake light.
Engine Oil Change:
Every 30-50 hours of operation or annually. Check manual for specific recommendations.
Air Filter Cleaning:
Every 10-20 hours of operation, or more frequently in dusty conditions.
Spark Plug Inspection:
Every 30-50 hours of operation. Check gap and condition.
Chain Lubrication And Adjustment:
Every 10-20 hours of operation. Check for proper tension.
Valve Clearance Check:
Typically every 100-150 hours or annually. Consult manual for precise interval and procedure.
Engine Oil:
SAE 10W-40, API SG or higher
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (check reservoir cap for specific type)
Gear Oil:
N/A (Separate transmission oil is not a feature; engine oil lubricates transmission)
Common Issues:
Carburetor gumming due to fuel sitting, throttle cable wear, rear axle seal leaks, CVT belt wear (though less common on this specific model compared to higher displacement ATVs).
Throttle Limiter Adjustment:
The throttle limiter screw can become loose or misadjusted, affecting speed control. Regular checks are recommended.
Heritage:
Suzuki has a long history in powersports, known for its engineering prowess in motorcycles, ATVs, and marine engines. The QuadSport line represents their commitment to the sport ATV market.
Evolution:
The LT-Z90 is an evolution of Suzuki's youth ATV offerings, building on the success of models like the LT80. It introduced a more modern chassis, fuel injection (on later models, but this 2008 is carbureted), and improved suspension compared to its predecessors.
Production Era:
The LT-Z90 was produced for several years, with the 2008 model being a representative of this generation.
