Target Audience:
Owners, DIY mechanics, and professional service technicians working on 1999 Polaris Scrambler 400 and 500 ATVs.
Value Proposition:
Provides essential information for maintaining, repairing, and troubleshooting the specific ATV models, saving time and money on professional service.
Content Focus:
Detailed procedures, diagrams, troubleshooting guides, and specifications tailored to the 1999 models.
Engine System:
Complete engine overhaul, top-end, bottom-end, cooling system, lubrication system, fuel system components (carburetor).
Transmission Drivetrain:
Gearbox, clutch, drive shafts, differential (if applicable), chain/belt drive maintenance and adjustment.
Suspension Steering:
Front and rear suspension systems, shock absorbers, steering mechanism, tie rods, wheel alignment.
Braking System:
Hydraulic brake system, brake fluid, calipers, master cylinder, brake lines, pad and shoe replacement.
Electrical System:
Ignition system, starting system, charging system (stator, regulator/rectifier), lighting, battery, wiring diagrams, troubleshooting.
Chassis Bodywork:
Frame inspection, body panel removal/installation, seat, fenders, handlebars, controls.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain lubrication and adjustment, battery care, air filter cleaning/replacement.
Troubleshooting:
Diagnostic procedures for common performance issues, starting problems, electrical faults, and mechanical failures.
Disassembly Reassembly:
Detailed step-by-step instructions for major component removal and installation.
Specifications Data:
Torque values, clearances, fluid capacities, electrical specifications, engine timing.
Depth Of Coverage:
Comprehensive, covering everything from basic maintenance to in-depth engine rebuilds and electrical diagnostics.
Engine Type 400:
Liquid-cooled, 2-stroke, single-cylinder (likely Polaris's own design or a derivative).
Engine Type 500:
Liquid-cooled, 4-stroke, single-cylinder (likely a Polaris Liberty engine variant).
Horsepower 400 Approx:
Estimated 30-35 HP
Horsepower 500 Approx:
Estimated 40-45 HP
Carburetion 400:
Mikuni VM Series carburetor (specific model number required from manual).
Fuel Delivery 500:
Carburetor (likely Keihin or Mikuni, specific model number required from manual).
Engine Oil Change:
Typically every 50-100 operating hours or annually (refer to manual for exact intervals and specific oil type).
Gearbox Oil Change:
Typically every 100-200 operating hours or annually (refer to manual for exact intervals).
Air Filter Cleaning:
Recommended every 20-40 operating hours or as needed based on dusty conditions.
Engine Oil Type 400:
2-stroke oil, specific API TC-W3 rated oil recommended (refer to manual for exact viscosity and brand).
Engine Oil Type 500:
SAE 20W-50 or SAE 10W-40 (depending on temperature range), API SG or higher (refer to manual for exact specification).
Gearbox Oil Type:
Polaris Demand Drive Fluid (front differential) or SAE 80W-90 gear oil for rear gearbox (refer to manual).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (refer to manual for exact specification).
Common Wear Items:
Brake pads, suspension bushings, drive belts (CVT), wheel bearings, carburetor jets.
Electrical Gremlins:
Wiring harness issues, stator failures, and regulator/rectifier problems can occur with age and vibration. Detailed troubleshooting is crucial.
Carburetor Maintenance:
Carburetor cleaning and adjustment is often necessary for optimal performance, especially after periods of storage or fuel contamination.
Polaris Atv History:
Polaris is a long-standing American manufacturer known for its off-road vehicles, including ATVs and snowmobiles, with a focus on performance and utility.
Scrambler Line History:
The Scrambler line was Polaris's performance-oriented ATV, often featuring more powerful engines, sportier suspension, and aggressive styling compared to utility models.
Production Era:
The Scrambler 400 and 500 were popular models in the late 1990s and early 2000s, representing a significant segment of Polaris's sport ATV offerings.