🏷️ Basic Information Identification Make: Yamaha Model: Mountain Max Model Variants: 600, 700 Year: 1999 Codes Product Id: YMM99 👋 Introduction Market Position Segment: Performance Trail and Mountain Snowmobile Competitive Analysis Competitors: Ski-Doo Summit, Polaris RMK, Arctic Cat Mountain Cat Key Features Vehicle Focus: Designed for challenging mountain terrain, offering excellent power-to-weight ratio and agile handling. 📋 Manual Details Coverage Areas Manual Type: Service Manual Language: English Format: PDF Download Page Count Estimated Page Count: Approx. 300-400 pages (typical for this era and model complexity) 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel System, Exhaust System, Drivetrain, Transmission (CVT), Drive/Driven Clutch Systems Chassis And Suspension: Front Suspension (AWS - Anti-Wide Steering), Rear Suspension (ProAction Plus), Steering System, Brakes (Hydraulic Disc), Tracks and Skis Electrical And Ignition: Ignition System (CDI), Lighting System, Gauges and Instruments, Battery, Starter System, Wiring Diagrams Procedures Included Maintenance: Regular Service Intervals, Lubrication, Adjustments, Inspections Repair: Component Disassembly, Reassembly, Overhaul, Replacement Troubleshooting: Diagnostic Procedures, Symptom-Based Troubleshooting Charts, Common Issues and Solutions Technical Depth Depth: Comprehensive (from basic maintenance to complete engine and drivetrain rebuilds) 📊 Manual Specifications File Format Digital Format: Searchable PDF Print Quality Image Resolution: High-resolution scans of original factory manual pages for clarity. Binding Type Binding: N/A (Digital Download) Paper Type Paper Quality: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type 600: Yamaha 2-stroke, 2-cylinder, Reed Valve, Liquid-Cooled Engine Type 700: Yamaha 2-stroke, 2-cylinder, Reed Valve, Liquid-Cooled Bore Stroke 600: 73.0 mm x 73.0 mm Bore Stroke 700: 82.0 mm x 66.2 mm Displacement 600: 597 cc Displacement 700: 698 cc Performance Horsepower 600: Approx. 115-120 HP (estimated) Horsepower 700: Approx. 130-135 HP (estimated) Fuel System Carburetion: Dual Mikuni VM34SS (likely for 600), Dual Mikuni VM36SS (likely for 700) Carburetors Fuel Type: Unleaded gasoline (91 octane or higher recommended) Oil Injection: Yamaha Autolube (Separate Oil Tank) 🔧 Transmission Standard Transmission Type: CVT (Continuously Variable Transmission) Drive Clutch: Yamaha Max-Flo Drive Clutch Driven Clutch: Yamaha DD Driven Clutch Features Gear Reduction: Forward, Neutral, Reverse (usually via a chaincase) 📐 Dimensions Exterior Track Width: Standard mountain track width for optimal flotation (e.g., 15 inches) Track Length: Extended mountain track length for deep snow (e.g., 136 inches, possibly longer options) Ski Stance: Adjustable or specific stance for mountain handling Weights Dry Weight 600: Approx. 470 lbs (estimated) Dry Weight 700: Approx. 490 lbs (estimated) 🛡️ Safety Features Active Features Braking System: Hydraulic Disc Brake with ventilated rotor Throttle Safety: Thumb throttle with safety lockout mechanism Passive Features Kill Switch: Handlebar-mounted engine kill switch with lanyard Lighting: Headlight, Taillight, Brakelight 💡 Technology Features Infotainment Gauge Cluster: Analog speedometer, tachometer, engine temperature gauge, fuel gauge, and indicator lights. Driver Assistance Throttle Control: Ergonomic thumb throttle for precise power delivery. Connectivity Data Ports: N/A (No digital diagnostic ports common on this era of snowmobile). 🔧 Maintenance Service Intervals Oil Change Interval: Refer to manual for specific intervals based on mileage or operating hours; typically annual or after significant use. Spark Plug Replacement: Recommended every 1000-1500 miles or annually. Track Tension Adjustment: Check and adjust track tension regularly as per manual specifications. Fluid Specifications Engine Oil Type: Yamaha 2-Stroke Snowmobile Oil or equivalent API TC-W3 certified oil. Coolant Type: Ethylene Glycol based antifreeze (50/50 mix with distilled water) for -34°C (-30°F) protection. Chaincase Oil Type: Yamalube Gear Oil (GL-4 SAE 80W-90) or equivalent. Known Issues Carburetor Icing: Potential for carburetor icing in specific cold/humid conditions; manual may offer solutions. Clutch Maintenance: Regular cleaning and inspection of drive and driven clutches for wear and proper function are crucial for CVT longevity. Suspension Bushings: Wear of suspension bushings and ball joints over time; requires periodic inspection and replacement. 📚 Vehicle History Brand Heritage Heritage Focus: Yamaha's long-standing reputation for reliable and powerful snowmobile engines and chassis. Model Evolution Mountain Max Lineage: Continuation of Yamaha's performance-oriented mountain snowmobile line, building on previous generations with enhanced power and suspension. Production Manufacturing Location: Likely manufactured in Japan or North America by Yamaha Motor Corporation. 🏆 Awards & Recognition Recognitions Industry Awards: Likely received positive reviews and accolades from snowmobile publications of the era for its performance and mountain capability.