Engine:
Detailed diagrams, specifications, and procedures for the Shovelhead engine, including disassembly, assembly, and troubleshooting.
Transmission:
Information on the 4-speed constant mesh transmission, including clutch, shift mechanisms, and lubrication.
Electrical System:
Wiring diagrams, ignition system details, lighting, charging system (generator/regulator), and starter motor.
Fuel System:
Carburetor (likely Linkert or similar) tuning, rebuilding, and fuel delivery system.
Chassis And Suspension:
Front fork (leading link or telescopic depending on specific configuration), rear shock absorbers, frame inspection, and steering head bearings.
Brakes:
Drum brake systems (front and rear), including adjustment and shoe replacement.
Bodywork And Trim:
Fairing (batwing), saddlebags, fenders, seat mounting, and chrome trim component identification and repair.
Frame And Forks:
Detailed instructions for fork disassembly, seal replacement, damper rod servicing, and steering head bearing maintenance.
Wheel And Tire:
Information on wheel bearing maintenance, tire installation and balancing, and spoke adjustment.
Routine Maintenance:
Oil changes, filter replacement, chain adjustment, spark plug service, lubrication points.
Engine Rebuild:
Complete engine disassembly, inspection, machining specifications, reassembly, and break-in procedures.
Transmission Overhaul:
Gearbox disassembly, inspection of gears and shafts, bearing replacement, and reassembly.
Electrical Diagnostics:
Troubleshooting electrical faults using wiring diagrams, testing components like ignition coils, generators, and regulators.
Suspension Service:
Fork oil changes, seal replacement, and rear shock absorber inspection and replacement.
Carburetor Adjustment And Rebuild:
Step-by-step instructions for tuning idle, jetting, and complete carburetor overhaul.
Troubleshooting Charts:
Includes diagnostic flowcharts and symptom-based troubleshooting guides for common mechanical and electrical issues.
Wiring Diagrams:
Comprehensive, often color-coded, wiring diagrams for all electrical circuits, essential for diagnostics.
Depth:
Professional-level diagnostic and repair procedures, including torque specifications, clearance measurements, and part tolerances.
Specifications Detail:
Provides precise torque values, clearance specifications for engine and drivetrain components, and bearing preloads.
Rebuild Instructions:
Detailed step-by-step instructions for complete engine, transmission, and carburetor overhauls, suitable for a full restoration.
Engine Type:
Air-cooled, 45-degree V-twin OHV (Shovelhead)
Displacement:
74 cubic inches (1200cc)
Bore X Stroke:
3.4375 in x 4.00 in (87.3 mm x 101.6 mm)
Compression Ratio:
Approximately 7.0:1 (varies slightly)
Horsepower Est:
55-60 HP (approximate, at 5000 RPM)
Torque Est:
75-80 lb-ft (approximate, at 3500 RPM)
Carburetor:
Linkert M-series (e.g., M-74B) or Keihin butterfly carburetor, depending on specific production run.
Fuel Type:
Unleaded gasoline (minimum 87 octane recommended for modern use).
Ignition:
Battery and coil, breaker point ignition system.
Oil Change Interval:
Every 2,000-3,000 miles or 6 months (typical for the era).
Primary Chain Tensioner:
Check and adjust as needed, typically at oil change intervals.
Spark Plug Replacement:
Every 6,000-10,000 miles.
Engine Oil Type:
Harley-Davidson Plus-20 (or equivalent high-quality motorcycle specific oil, SAE 20W-50 is common modern equivalent for original specs).
Engine Oil Capacity:
3 quarts (with filter change).
Primary Drive Oil:
Harley-Davidson Primary Chaincase Lubricant (or equivalent, typically a medium viscosity oil like SAE 70W-85).
Primary Drive Oil Capacity:
1 quart (typically to the bottom of the clutch plates).
Carburetor Wear:
Linkert carburetors can develop wear in the throttle shaft and needle seat, leading to poor idle and fuel control.
Generator Charging System:
Generator output and voltage regulator can be prone to failure or require frequent adjustment.
Oil Leaks:
Common on older V-twins due to aging seals and gaskets. Requires regular inspection and proactive replacement.
Cam Chain Tensioner:
Original tensioners could wear prematurely, leading to potential cam chain slap and damage.
Shifter Lever Play:
Wear in the shifter linkage and pawl can cause false neutrals or difficulty engaging gears.
