Target Audience:
Owners and mechanics of 1971 Harley-Davidson Shovelhead motorcycles seeking detailed repair, maintenance, and troubleshooting information.
Comparison:
Provides a crucial resource for preserving and maintaining classic Harley-Davidson motorcycles, offering a level of detail often sought after by enthusiasts and professionals alike. Superior to generic motorcycle repair guides for this specific model.
Unique Selling Points:
Model-specific coverage for a highly collectible motorcycle; detailed diagrams; step-by-step procedures; comprehensive troubleshooting; essential for preserving originality and performance.
Engine Systems:
Engine assembly, disassembly, tuning, carburetor, ignition system, lubrication system, cooling system (air-cooled specific), internal engine components (pistons, rings, valves, crankshaft, camshaft), oil pump.
Transmission Systems:
Clutch operation, gear selection, primary drive, secondary drive (belt/chain), transmission case, internal transmission components, lubrication.
Chassis Systems:
Frame inspection and repair, front forks (suspension, damping), rear shock absorbers, wheel bearings, steering head bearings, brake systems (drum and disc, as applicable), electrical system (wiring diagrams, battery, charging system, lighting, ignition), fuel system (tank, lines, petcock), exhaust system, controls (throttle, clutch, brake levers).
Maintenance Procedures:
Regular servicing, oil changes, filter replacements, chain/belt adjustment, spark plug replacement, brake adjustments, clutch adjustments, carburetor tuning, ignition timing adjustments, pre-ride inspections, winterization procedures.
Repair Procedures:
Engine rebuilds, transmission overhaul, carburetor rebuilds, ignition system diagnostics and repair, brake component replacement, suspension component replacement, electrical system troubleshooting, frame straightening, bodywork repair.
Troubleshooting Guides:
Diagnosing common starting issues, running problems, electrical faults, brake performance issues, transmission engagement problems.
Depth:
Comprehensive: Covers everything from routine maintenance and minor adjustments to complete engine and transmission rebuilds, including diagnostic procedures and specifications. Suitable for DIY mechanics and professional technicians.
Engine Type:
Air-cooled, 45-degree V-twin OHV
Displacement:
74 cu in (1200cc) and 80 cu in (1340cc) variations existed across Shovelhead production, with 1971 models primarily featuring the 74 OHV.
Bore X Stroke:
For 74 OHV: 3.4375 in x 4.25 in (87.3 mm x 108.0 mm)
Compression Ratio:
Varies by specific model and tuning, typically around 8.0:1 to 8.5:1 for stock configurations.
Horsepower:
Estimated 55-65 HP (stock, varies with tuning and exact configuration)
Torque:
Estimated 65-75 lb-ft (stock, varies with tuning and exact configuration)
Carburetor:
Typically a Linkert M-series or Keihin butterfly carburetor for 1971 models. Manual will detail specific models and their adjustments.
Fuel Type:
Unleaded gasoline, typically 91 octane or higher recommended for optimal performance and longevity.
Oil Type:
Varies; historically Harley-Davidson recommended specific mineral-based motorcycle oils. Manual will specify exact SAE grades and API classifications (e.g., SAE 20W-50, HD-specific blends).
Ignition Type:
Contact breaker points ignition system with a distributor or magneto (depending on exact sub-model and upgrades). Manual details timing specifications and component replacement.
Transmission Type:
4-speed constant mesh, foot shift, hand clutch.
Optional Transmissions:
None typically offered for this year; 4-speed was standard.
Clutch Type:
Dry, multi-plate, cable-actuated.
Primary Drive:
Chain drive, enclosed in a primary cover with wet clutch operation.
Secondary Drive:
Chain drive (commonly) or belt drive, depending on specific model configuration. Manual will cover maintenance for both.
Transmission Fluid Type:
Manual transmission fluid (MTF) or specific Harley-Davidson recommended gear oil. Manual will specify viscosity and API rating (e.g., SAE 80W-90).
Wheelbase:
Varies by specific model (e.g., FLH, FX), typically around 60-63 inches.
Length:
Varies by specific model, typically around 90-95 inches.
Dry Weight:
Varies by specific model (FLH, FX), typically 550-650 lbs.
Fuel Capacity:
Typically 4.0 - 5.0 US gallons (15-19 liters).
Front Tire Size:
Commonly 3.00-19 or similar, manual will specify exact types and recommended pressures.
Rear Tire Size:
Commonly 4.00-18 or 4.25-18, manual will specify exact types and recommended pressures.
Wheel Bolt Pattern:
Not applicable for spoke wheels common on this era; refers to hub mounting. Manual details spoke tensioning and truing.
Safety Ratings:
Not applicable (Motorcycle). Focus is on mechanical integrity and safe operation.
Braking System:
Front: Single disc brake or drum brake. Rear: Drum brake. Manual covers inspection, service, and adjustment of both.
Lighting System:
Headlight, taillight, brake light, turn signals. Manual details wiring and bulb specifications.
Oil Change Interval:
Typically every 2,000-3,000 miles or annually, whichever comes first. Manual provides detailed guidance.
Primary Chain Adjustment:
Recommended every 1,000-2,000 miles, or as needed if chain slack increases. Manual provides specific procedures.
Spark Plug Replacement:
Every 5,000-10,000 miles, depending on plug type and usage. Manual will list correct spark plug part numbers and gap settings.
Ignition Timing Adjustment:
Periodically check and adjust as needed, especially if performance issues arise. Manual provides detailed timing procedures.
Engine Oil Capacity:
Approximately 3 quarts (2.8 liters) for 74 OHV, but always verify with the dipstick. Manual specifies exact capacity and recommended oil types.
Transmission Oil Capacity:
Approximately 1 quart (0.95 liters). Manual will specify exact capacity and fluid type.
Primary Chain Case Oil:
Typically a separate oil from engine and transmission, manual specifies type and capacity.
Common Issues:
Oil leaks (especially from crankcase seals and pushrod tubes), carburetor tuning difficulties, points ignition adjustment precision, valve guide wear, primary chain adjustment requirements, cam follower wear. Manual addresses these comprehensively.
Manufacturer:
Harley-Davidson Motor Company.
Shovelhead Introduction:
The Shovelhead engine was introduced in 1966, replacing the Panhead. It featured updated cylinder heads that resembled a shovel. 1971 marks a significant year in its production, with evolving engine and chassis designs.
Production Years Shovelhead:
1966-1984.
1971 Significance:
1971 saw Harley-Davidson transitioning through various design changes, including the introduction of electronic ignition on some models later in the decade, but 1971 still predominantly featured points ignition. This manual captures that specific era's technology.
Model Recognition:
The Harley-Davidson Shovelhead is an iconic motorcycle in its own right, celebrated within the classic motorcycle community for its raw power and distinctive sound. The 1971 model is a sought-after vintage machine.
Reliability Reputation:
While known for character and performance, Shovelheads of this era can require diligent maintenance to ensure optimal reliability due to their age and design. This manual is key to maintaining it.
