Market Position:
The Yamaha VMX12 Vmax, affectionately known as the 'King of Cool,' was a groundbreaking muscle cruiser that redefined motorcycle performance and styling in its era. It appealed to riders seeking exhilarating acceleration and a distinctive, aggressive aesthetic.
Competitive Analysis:
During its production run, the Vmax competed with other large-displacement, performance-oriented motorcycles, but its unique V4 engine configuration, shaft drive, and drag-racing inspired performance gave it a distinct advantage and a cult following.
Key Features:
Iconic V-Boost system for increased power at higher RPMs, 1200cc V4 engine, shaft drive, distinctive styling, powerful acceleration, and a legendary reputation.
Coverage Areas:
All major mechanical, electrical, and bodywork systems; troubleshooting, repair, and maintenance procedures.
Manual Type:
Workshop Service Repair Manual
Target Audience:
Professional motorcycle technicians, experienced home mechanics, and Yamaha Vmax enthusiasts.
Systems Covered:
Engine, Fuel System, Ignition System, Cooling System, Drivetrain, Transmission, Clutch, Brakes (Front & Rear), Suspension (Front & Rear), Steering, Electrical System (Wiring Diagrams, Components), Chassis, Bodywork, Wheels & Tires.
Electrical System Details:
Comprehensive wiring diagrams are included, illustrating the entire electrical system from battery to lights, ignition, starter, and accessories. Fault finding and diagnostic procedures for electrical circuits are also provided.
Frame And Suspension:
Includes procedures for fork disassembly, seal replacement, spring checks, rear shock absorber maintenance and adjustment, as well as frame inspection and alignment checks.
Procedures Included:
Routine maintenance, lubrication, inspections, disassembly, cleaning, repair, assembly, adjustments, troubleshooting, component testing, overhaul procedures, torque specifications, electrical diagnostics, frame and suspension alignment.
Troubleshooting Methodology:
The manual employs a systematic approach to troubleshooting, often utilizing diagnostic flowcharts and symptom-based problem solving to help technicians pinpoint issues efficiently.
Engine Rebuild:
Detailed procedures for complete engine disassembly, inspection of critical components (pistons, rings, bearings, crankshaft), cylinder head overhauls, and reassembly with torque specifications.
Technical Depth:
Comprehensive, step-by-step instructions suitable for professional mechanics and experienced DIY enthusiasts. Includes detailed explanations, exploded diagrams, and diagnostic flowcharts.
Diagnostic Capabilities:
Covers basic electrical testing using multimeters, component testing, and systematic diagnosis of common mechanical and electrical faults.
Diagnostic Tools:
The manual implicitly assumes the use of common automotive tools and potentially specialized motorcycle tools, with many procedures requiring specific torque wrenches and measurement instruments.
Engine Type:
Four-stroke, liquid-cooled, V4
Bore X Stroke:
81mm x 58mm
Valvetrain:
DOHC, 4 valves per cylinder
Compression Ratio:
10.5:1
Horsepower Est:
140-145 hp (depending on year and market)
Torque Est:
82-87 ft-lbs (depending on year and market)
Top Speed Est:
Approximately 220 km/h (137 mph)
Fuel Delivery:
Carbureted (4 x Mikuni 36mm with V-Boost on later models)
Fuel Type:
Unleaded gasoline (91 octane or higher recommended)
Fuel Tank Capacity:
15 liters (3.9 US gallons)
Overall Length:
Approximately 2300 mm (90.6 in)
Overall Width:
Approximately 795 mm (31.3 in)
Overall Height:
Approximately 1160 mm (45.7 in)
Ground Clearance:
Approximately 135 mm (5.3 in)
Dry Weight:
Approximately 261 kg (575 lbs)
Wet Weight:
Approximately 283 kg (624 lbs)
Wheelbase:
Approximately 1515 mm (59.6 in)
Safety Ratings:
N/A (Motorcycle safety ratings are not standardized like automobiles).
Active Features:
Powerful dual front disc brakes, single rear disc brake, responsive suspension.
Passive Features:
Sturdy chassis construction, robust frame.
Infotainment Features:
N/A (Focus is on performance and mechanicals).
Driver Assistance Features:
N/A (Focus is on performance and mechanicals).
Connectivity Features:
N/A (Focus is on performance and mechanicals).
Engine Management System:
Mechanical ignition system with automatic timing advance, V-Boost system (electronically controlled intake valves).
Lighting System:
Halogen headlight, standard incandescent taillight and turn signals.
Service Intervals:
The manual details specific intervals for: Oil changes (e.g., every 3000-5000 km or 6 months), spark plug inspection/replacement, valve clearance checks, brake fluid flushes, coolant checks, drive shaft lubrication. Recommended intervals vary based on usage conditions.
Valve Clearance Interval:
Every 12,000 km (7,500 miles)
Brake Fluid Change Interval:
Every 2 years or as needed based on condition.
Engine Oil:
Yamaha recommends Yamalube 4 (or equivalent API SG, SAE 10W-40) for most conditions. Check manual for specific viscosity charts.
Coolant:
Ethylene glycol-based antifreeze coolant (50% mixture with distilled water). Refer to manual for specific Yamaha coolant part number if applicable.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (refer to manual for specific recommendation for front and rear systems).
Final Drive Oil:
Yamaha recommends Yamalube Gear Oil (or equivalent API GL-4, SAE 80W-90).
Common Issues:
V-Boost system malfunctions, carburetor synchronization issues, charging system problems (stator/regulator), drive shaft spline wear (if not regularly greased), clutch cable adjustment, front fork seal leaks. The manual provides troubleshooting steps for these.
Tire Specifications:
Front: 130/90-16, Rear: 150/90-15 (typical, verify in manual for specific model variations).
Spark Plugs:
NGK CR9E (or equivalent, consult manual for exact specification).
Brand Heritage:
Yamaha Motor Company, established in 1955, has a rich history of producing high-performance motorcycles across various categories, known for innovation and engineering excellence.
Model Evolution:
Introduced in 1985, the Vmax was revolutionary. Key updates over its long production run included the introduction of the V-Boost system (1985-1992), refined fuel injection on later models (post-1996 in some markets, though this manual covers pre-2000 carburetor models), and minor cosmetic and chassis tweaks. The fundamental design remained largely consistent.
Production Years:
1985-2007 (original generation covered by this manual: 1985-2000)
Manufacturing Location:
Japan
