Segment:
Classic American V-Twin Motorcycle
Target Audience:
Harley-Davidson Enthusiasts, Owners, Independent Repair Shops, Restoration Specialists
Competitors:
Service manuals for other American V-twin manufacturers of the era (e.g., Indian, Excelsior-Henderson - though less direct comparison for 1981).
Feature 1:
Detailed step-by-step repair procedures.
Feature 2:
Clear, exploded view diagrams and illustrations.
Feature 3:
Comprehensive troubleshooting guides.
Feature 4:
Vital technical specifications and torque values.
Engine:
Shovelhead Engine (Evolution of Panhead), Top End, Bottom End, Cooling, Lubrication
Fuel System:
Carburetor (e.g., Keihin butterfly, Mikuni VM), Fuel Tank, Fuel Lines, Fuel Pump (if applicable)
Ignition System:
Magneto, Points, Coil, Spark Plugs, Wiring
Transmission:
4-Speed Gearbox (e.g., Cruise Drive), Clutch Assembly, Primary Drive, Final Drive (Belt/Chain)
Chassis:
Frame, Swingarm, Forks (e.g., 35mm conventional), Rear Shocks, Bearings
Brakes:
Front Disc Brakes, Rear Disc Brakes, Master Cylinders, Calipers, Lines, Fluid
Electrical System:
Wiring Diagrams, Battery, Charging System (Alternator/Generator), Lighting, Switches, Gauges
Bodywork:
Fenders, Fuel Tank, Seat, Handlebars, Controls, Exhaust System
Maintenance:
Routine Service, Oil Changes, Filter Replacements, Lubrication Points, Spark Plug Replacement, Chain/Belt Adjustment
Troubleshooting:
Diagnostic Procedures for Engine, Electrical, Fuel, and Drivetrain Issues
Repair:
Engine Rebuilds, Transmission Overhauls, Brake System Repairs, Electrical Component Replacement, Suspension Overhauls
Installation:
Component Replacement and Installation Guides
Depth:
Comprehensive (from basic adjustments to full engine and transmission rebuilds)
Engine Type:
Air-Cooled, 45-degree V-twin, OHV
Displacement:
74 cubic inches (1208 cc) and 80 cubic inches (1310 cc) - Shovelhead engine variants
Bore X Stroke:
Varies by displacement, e.g., 80ci: 3.50" x 4.25"
Compression Ratio:
Typically 7.0:1 to 8.5:1 (varies with specific build)
Valve Train:
Overhead Valve (OHV) with pushrods and rocker arms
Horsepower:
Estimated 60-70 HP (varies)
Torque:
Estimated 70-80 ft-lbs (varies)
Carburetor:
Often Keihin butterfly or Mikuni VM series
Fuel Type:
Unleaded gasoline
Fuel Capacity:
Typically 3.5 - 5.0 gallons (varies by tank style)
Wheelbase:
Approximately 62 inches (varies slightly)
Length:
Approximately 90 inches (varies)
Width:
Approximately 35 inches (at handlebars, varies)
Dry Weight:
Approximately 590-620 lbs (varies by equipment)
Gross Vehicle Weight Rating:
Approx. 900-950 lbs
Oil Change:
Typically every 2,000-3,000 miles or annually, whichever comes first.
Primary Fluid Change:
Typically every 5,000-10,000 miles or annually.
Spark Plugs:
Inspect every 5,000 miles, replace as needed (specific interval varies).
Drive Belt Tension:
Inspect and adjust every 5,000 miles.
Engine Oil:
Harley-Davidson 20W50 motorcycle oil or equivalent (e.g., SYN3, Shell Rotella T triple protection 15W-40 can be used in Shovelheads, but 20W50 is preferred for originality and viscosity.)
Primary Chaincase Lubricant:
Harley-Davidson Primary Chaincase Lubricant or equivalent.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (check specific reservoir cap)
Leaks:
Common for Shovelheads to develop oil leaks from gaskets, seals, and pushrod tubes due to age and design.
Rocker Box Gaskets:
Prone to blowing gaskets, requiring regular inspection and replacement.
Carburetor Tuning:
May require periodic tuning or rebuild due to wear or atmospheric changes.
Primary Clutch Adjustment:
Clutch adjustment can be sensitive and require regular checking.
Heritage:
Harley-Davidson is an iconic American motorcycle manufacturer with a legacy dating back to 1903, known for its V-twin engines and distinctive styling.
Evolution Of Fxwg:
The FXWG ('Wide Glide') was part of Harley-Davidson's 'Factory Custom' line, featuring a raked-out front end (hence 'Wide Glide') reminiscent of custom choppers, blending the traditional Harley feel with a more aggressive stance.
Shovelhead Era:
The Shovelhead engine, produced from 1966 to 1984, was an evolution of the Panhead and a predecessor to the Evolution (Evo) engine. It was known for its distinctive sound and character.
Production Period:
Shovelhead engines were produced from 1966-1984. The FXWG model itself was produced for a significant portion of this era, with the 1981 model being a key example.
Manufacturing Location:
United States (Milwaukee, Wisconsin and other facilities)
Model Recognition:
The FXWG and the Shovelhead engine are highly regarded by collectors and enthusiasts for their classic styling, raw V-twin character, and place in Harley-Davidson history.
Reliability Ratings:
Variable; known for requiring frequent maintenance and having some inherent mechanical quirks characteristic of its era. However, well-maintained examples are robust.
Certifications:
N/A (Product is a manual, not a vehicle certification)
