Positioning:
The Suzuki QuadRunner LT50 was positioned as an entry-level, recreational ATV, often popular with younger riders or as a versatile utility machine for light tasks. This manual caters to owners seeking to maintain and repair their vintage QuadRunner.
Competitors:
Competed against similar small-displacement ATVs from manufacturers like Honda (e.g., TRX70/125), Yamaha (e.g., Badger), and Kawasaki (e.g., KLT).
Manual Value:
Provides comprehensive, year-specific repair and maintenance information crucial for preserving and fixing these older, but capable, ATVs. Highlights detailed procedures, diagrams, and troubleshooting for all critical systems.
Engine Mechanics:
Engine rebuild, valve jobs, top-end and bottom-end overhaul, piston and cylinder assembly, crankshaft and connecting rod service, cooling system (if applicable, typically air-cooled), lubrication system.
Transmission Drivetrain:
Transmission overhaul, clutch service, gearbox operation, drive chain adjustment and replacement, differential (if equipped).
Fuel System:
Carburetor disassembly, cleaning, adjustment, and rebuilding; fuel tank service; fuel line inspection and replacement; fuel filter maintenance.
Electrical System:
Ignition system troubleshooting and repair, starter motor service, charging system (stator, regulator/rectifier), battery maintenance, lighting system, wiring diagrams, electrical component testing.
Suspension Steering:
Front and rear suspension inspection, fork seal replacement, shock absorber service, steering linkage adjustment, tie rod end replacement, wheel bearing service.
Braking System:
Brake lever and cable adjustment, brake shoe replacement, brake drum cleaning and inspection, brake system bleeding (if hydraulic), caliper service (if applicable).
Chassis Bodywork:
Frame inspection, seat removal and installation, fender replacement, handlebar service, footpeg mounting, general chassis component inspection and tightening.
Maintenance:
Regular maintenance procedures, lubrication points and schedules, filter replacement intervals, tune-up procedures, general inspection checklists.
Troubleshooting:
Systematic troubleshooting guides for common problems, diagnostic procedures for engine performance, electrical faults, and mechanical issues.
Repair:
Step-by-step repair instructions for all major components and systems, including detailed disassembly and reassembly sequences.
Technical Specifications:
Detailed technical specifications for all components, including torque values, clearances, fluid capacities, and performance data.
Depth:
Comprehensive; covers everything from basic maintenance and troubleshooting to full engine and transmission rebuilds, including detailed diagnostic information and electrical schematics.
Searchability:
Keyword searchable (using Ctrl+F or similar functions), bookmarked for easy navigation.
Quality:
High-quality scans/reproductions with clear images and text, reworked for optimal usability.
Binding:
Digital (PDF download) - does not apply to physical binding.
Paper Type:
Digital (PDF download) - does not apply to physical paper type.
Engine Type:
Single-cylinder, 2-stroke (typical for this era and displacement).
Displacement:
Approximately 50cc (exact specification may vary slightly by model year, e.g., 49cc or similar).
Cooling System:
Air-cooled
Horsepower:
Estimated 3-5 HP (Typical for 50cc 2-stroke engines of this vintage).
Torque:
Estimated 2-3 lb-ft (Approximate, specific figures not readily available without detailed spec sheets).
Carburetor Type:
Likely a Mikuni VM series or similar small-bore carburetor, e.g., VM12 or VM14. Specific model number will be in the manual.
Fuel Type:
Unleaded gasoline mixed with 2-stroke oil (pre-mix, typically 32:1 or 50:1 ratio, consult manual for exact specification).
Ignition System:
CDI (Capacitor Discharge Ignition) or similar electronic ignition.
Type:
Automatic CVT (Continuously Variable Transmission) or Torque Converter with reduction gearing.
Optional Type:
Not applicable, likely single transmission type for this model.
Drive System:
2WD (Two-Wheel Drive), shaft or chain drive to rear axle.
Transmission Fluid:
Specific gear oil or transmission fluid type will be detailed in the manual; often a light gear oil or ATF for torque converter types.
Length:
Approx. 1300-1500 mm (Varies by specific year/design).
Width:
Approx. 700-800 mm.
Height:
Approx. 800-900 mm.
Dry Weight:
Approx. 70-85 kg.
Payload Capacity:
Typically designed for a single rider and light cargo; specific capacity not usually published for this class.
Front Tire Size:
Commonly 16x7.00-7 or similar AT tires.
Rear Tire Size:
Commonly 16x7.00-7 or 16x8.00-7 or similar AT tires.
Wheel Bolt Pattern:
Typically 4-stud pattern with specific bolt circle diameter (BC D).
Atv Safety Standards:
Designed to meet applicable safety standards for ATVs of its era; users must always wear appropriate safety gear.
Braking System Type:
Drum brakes (front and rear), mechanical actuation via cables. Some later models might have had disc brakes on one axle.
Throttle Limiter:
Many beginner ATVs of this era featured a throttle limiter screw or adjustable stop to control maximum speed.
Kill Switch:
Engine kill switch mounted on the handlebar for immediate shutdown.
Features:
Basic instrumentation – speedometer/odometer are uncommon on this model; typically features indicator lights for neutral, oil, and engine conditions.
Features:
None in the modern sense. Focus is on mechanical reliability and basic functionality. Safety features are limited to mechanical kill switches and throttle limiters.
Features:
No digital connectivity or smart features.
Oil Change Interval:
For the 2-stroke engine, oil is mixed with fuel. Gearbox oil change interval typically 3,000-5,000 miles or annually. Refer to manual for exact Suzuki recommendations.
Air Filter Cleaning:
Regular cleaning/replacement recommended, especially in dusty conditions. Check every 10-20 hours of operation or as specified in the manual.
Spark Plug Replacement:
Typically every 1,000-2,000 miles or as needed based on performance. Consult manual for specific plug type and gap.
Brake Adjustment:
Regular inspection and adjustment of brake cables and drum clearance for optimal braking performance.
2 Stroke Oil Type:
High-quality 2-stroke engine oil, TCW-3 rated or equivalent. Refer to manual for recommended brand and mix ratio (e.g., 50:1).
Transmission Gear Oil:
Specific weight gear oil (e.g., SAE 80 or SAE 90) or Automatic Transmission Fluid (ATF) may be specified. Consult the manual for exact type and capacity.
Common Problems:
Carburetor gumming/clogging due to infrequent use or stale fuel, wear in the CVT/torque converter components, electrical connector corrosion, and general wear and tear on suspension and brake components are common in vintage ATVs.
Engine Wear:
As a 2-stroke, proper lubrication is critical. Overheating or lean fuel mixtures can lead to piston/cylinder damage. Valve stem seals (if applicable for valve jobs) may degrade over time.
Brand History:
Suzuki has a long history of producing robust and reliable vehicles, including a significant presence in the ATV market since the early 1980s.
Lt50 Lineage:
The LT50 was one of Suzuki's foundational ATV models, establishing a reputation for durability and ease of use in the recreational segment.
Production Period:
1984-1990
Manufacturing Location:
Likely Japan or potentially other Suzuki manufacturing facilities.
