Positioning:
The MM600D and MM700D represented Yamaha's offering in the performance-oriented trail and mountain snowmobile segment during their production years, known for their reliability and capable engines.
Competitors:
Competed against models from Ski-Doo (e.g., Mach Z, Formula III), Arctic Cat (e.g., Thundercat, ZR), and Polaris (e.g., RMK, Indy).
Features:
Likely featured Yamaha's reliable twin-cylinder, liquid-cooled two-stroke engines, a comfortable rider position, and capable suspension for various snow conditions.
Engine:
Complete engine overhaul, diagnostics, troubleshooting, internal components, cooling system, lubrication system.
Carburetion:
Carburetor identification, adjustment, cleaning, rebuilding, troubleshooting, fuel delivery system.
Power Train:
Clutch (drive and driven), chaincase, gearbox, final drive, torque specifications.
Chassis:
Suspension (front and rear), steering system, skis, track system, braking system, frame components.
Electrical:
Ignition system, lighting, starter motor, battery, wiring diagrams, troubleshooting electrical faults, CDI unit.
Maintenance:
Routine checks, lubrication points, filter replacement, belt inspection, spark plug service.
Inspections And Adjustments:
Periodic inspections, tuning adjustments for engine performance, clutch alignment, suspension settings.
Repair:
Detailed step-by-step repair procedures for all major components, including engine rebuilds, transmission repairs, and chassis overhauls.
Troubleshooting:
Comprehensive troubleshooting guides for common and uncommon issues, including diagnostic charts and symptom-based solutions.
Depth:
Factory-level diagnostic and repair procedures, suitable for both experienced mechanics and DIY enthusiasts performing major overhauls or complex repairs.
Torque Values:
Detailed torque specifications for critical fasteners throughout the engine, drivetrain, chassis, and suspension components.
Clearances:
Engine internal clearances (piston-to-cylinder, bearing clearances), chain tension, belt deflection, and suspension pivot points.
Illustrations:
Hundreds of detailed illustrations, exploded views, and diagrams to visually guide repair and assembly processes.
Wiring Diagrams:
Complete electrical system wiring diagrams with component identification and wire colors for accurate troubleshooting.
Engine Type Mm600:
Liquid-cooled, 2-stroke, reed valve, parallel-twin (specific displacement likely 597cc based on model number).
Engine Type Mm700:
Liquid-cooled, 2-stroke, reed valve, parallel-twin (specific displacement likely 698cc based on model number).
Horsepower Mm600:
Estimated 100-110 HP (typical for this class and era).
Horsepower Mm700:
Estimated 115-125 HP (typical for this class and era).
Fuel Delivery Mm600:
Dual Mikuni carburetors (likely 38mm or 40mm, e.g., VM38).
Fuel Delivery Mm700:
Dual Mikuni carburetors (likely 38mm or 40mm, e.g., VM38).
Ignition System:
Digital CDI (Capacitor Discharge Ignition).
Oil System:
Autolube (automatic oil injection system).
Cooling System:
Liquid-cooled via radiator and fan.
Exhaust System:
Twin expansion chambers designed for optimal performance at mid-to-high RPM ranges.
Overall Length:
Specific dimensions vary by track length and chassis configuration, but typical for the era (approx. 100-115 inches).
Ski Stance:
Typical variable ski stance, often adjustable for different conditions.
Dry Weight:
Estimated 450-500 lbs (dry weight, without fluids/accessories).
Fuel Capacity:
Typically around 10-12 gallons.
Track Dimensions:
Standard track width likely 15 inches, with various lug heights available depending on specific model or intended use (e.g., 96" or 121" track length).
Safety Standards:
Manufactured to meet industry safety standards for snowmobiles of the era.
Braking System:
Hydraulic disc brake, typically mounted on the driveshaft or jackshaft.
Kill Switch:
Standard engine kill switch with lanyard for rider safety.
Lighting:
Headlights, taillight, and brake light for visibility.
Gauges:
Dashboard typically includes speedometer, tachometer, odometer, trip meter, coolant temperature gauge, and oil level indicator/warning light.
Features:
Limited driver assistance features by modern standards; focus is on mechanical systems and rider input.
Oil Change Interval:
Autolube system requires monitoring oil reservoir levels; manual will specify engine oil change frequency if applicable for internal engine oil.
Spark Plug Replacement:
Typically every 1,000-2,000 miles or annually, depending on usage. Specific plug types and gap are crucial.
Clutch Inspection:
Regular inspection of clutch weights, springs, and sheave condition is vital for optimal performance and longevity. Clutch alignment checks are also important.
Coolant Type:
Proprietary Yamaha coolant or equivalent ethylene glycol-based coolant with anti-corrosion additives for aluminum engines. Capacity and mixture ratio (e.g., 50/50) are critical.
Chaincase Oil:
Yamaha's recommended hypoid gear oil or equivalent API GL-4, SAE 80W-90. Capacity is typically around 150-200 ml.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid, depending on caliper specifications. Fluid flush intervals are important.
2-Stroke Oil:
Yamaha's recommended premium 2-stroke oil for oil injection systems, or a high-quality synthetic equivalent meeting JASO FD/API TC standards. Using the wrong oil can cause significant engine damage.
Common Wear Items:
Wear items include drive belts, sliders in the track suspension, carbides on skis, and clutch components (weights, rollers, bushings). Reed valves can also wear over time.
Overheating:
Can occur due to low coolant, blocked heat exchangers, or fan belt failure. Manual details checks.
Carburetor Issues:
Gumming, clogging, and improper adjustment are common, especially with fuel sitting for extended periods. Regular cleaning and jetting checks are recommended.
Heritage:
Yamaha has a long-standing reputation for building reliable and well-engineered snowmobiles since their entry into the market.
Evolution:
The MM series likely evolved from earlier Yamaha performance models, focusing on enhanced power delivery and handling for the turn of the millennium.
Production Era:
Production for these specific models was primarily focused around the 2000-2001 model years.
