Description:
The Yamaha VMAX VMX12 is an iconic performance cruiser renowned for its immense power and distinctive styling, often referred to as a 'muscle bike'.
Competitors:
Competed with other high-performance motorcycles and power cruisers of its era, though its unique V-four engine and styling set it apart.
Engine Configuration:
65-degree V-four, liquid-cooled
Design Philosophy:
Performance-oriented, drag-racing inspired styling
Value Proposition:
Essential tool for owners and technicians to maintain, diagnose, and repair the VMAX VMX12 effectively, preserving its performance and longevity.
Engine Mechanical:
Full disassembly, inspection, repair, and reassembly of engine components (pistons, rings, valves, camshafts, crankshaft, connecting rods, etc.)
Engine Fuel System:
Carburetor adjustment, cleaning, rebuilding, fuel pump inspection, fuel filter replacement
Cooling System:
Radiator, coolant hoses, thermostat, water pump inspection and service
Ignition System:
Spark plug specifications, ignition timing, coil testing, CDI unit troubleshooting
Transmission:
Gearbox disassembly, inspection, repair, clutch operation, shift mechanism servicing
Drivetrain:
Shaft drive system maintenance, universal joint inspection, final gear oil changes
Brakes System:
Brake caliper overhaul, brake fluid replacement, master cylinder service, disc and pad inspection
Suspension Front:
Fork oil change, seal replacement, spring inspection, damping adjustment procedures
Suspension Rear:
Shock absorber service, linkage inspection, swingarm bearing maintenance
Electrical System:
Wiring diagrams, charging system (stator, rectifier/regulator), battery maintenance, lighting system troubleshooting
Controls:
Handlebar, throttle, clutch, and brake lever adjustments and servicing
Frame And Bodywork:
Frame inspection, body panel removal and installation, seat servicing
Preventative Maintenance:
Scheduled maintenance tasks, lubrication points, fluid level checks
Troubleshooting:
Diagnostic flowcharts for common problems and symptoms
Repair Procedures:
Detailed, step-by-step instructions for component replacement and repair
Rebuild Instructions:
Complete engine and component rebuild procedures
Adjustment Procedures:
Carburetor sync, valve clearance adjustment, chain tension (if applicable, though VMAX is shaft drive), clutch cable adjustment
Disassembly Reassembly:
Detailed instructions for taking apart and putting back together all major motorcycle systems
Depth:
Highly detailed, suitable for professional technicians and experienced DIY mechanics
Diagnostic Level:
Advanced diagnostics for electrical and mechanical systems
Specification Detail:
Includes precise torque values, clearances, fluid types, and electrical resistance readings
Engine Type:
Four-stroke, V-four, DOHC, 16-valve
Displacement:
1198 cc (73.1 cu in)
Bore X Stroke:
82.0 mm x 75.0 mm
Compression Ratio:
10.5:1
Horsepower:
Approx. 140-145 hp @ 10,000 rpm (varies by market and specific model year)
Torque:
Approx. 86-90 lb-ft @ 8,000 rpm (varies by market and specific model year)
Carburetion:
Four Mikuni BSR32 constant velocity carburetors
Fuel Capacity:
15.0 L (3.9 US gal)
Cooling Method:
Liquid-cooled
Oil Type:
Yamaha High Performance SAE 20W-40 or SAE 10W-40 motorcycle oil
Oil Change Interval:
Every 4,000 km (2,500 miles) or 6 months
Air Filter Check:
Every 4,000 km (2,500 miles)
Spark Plug Replacement:
Every 12,000 km (7,500 miles)
Valve Clearance Check:
Every 16,000 km (10,000 miles)
Engine Oil Capacity:
3.4 L (3.6 US qt) with filter change
Cooling System Coolant:
Yamaha Genuine Coolant (50/50 mix of ethylene glycol and deionized water)
Common Issues Potential:
Carburetor synchronization drift, fuel line deterioration, aging electrical components, clutch slave cylinder leaks (on some models), front fork seal leaks.
Recommended Checks:
Regular inspection of fuel hoses, electrical connectors, and suspension seals is advised due to the age of typical VMAX models.
Manufacturer:
Yamaha Motor Company, Japan
Key Design Elements:
The VMAX was conceived as a 'superbike' for the street, focusing on raw power and a distinctive appearance.
Significant Updates:
While the core design remained, minor updates occurred over its production run, including brake system improvements and cosmetic changes. This manual covers the early '1TG' generation.
Production Locations:
Primarily manufactured in Japan