Market Position:
The Harley-Davidson Fat Boy is an iconic cruiser known for its distinctive styling, powerful V-twin engine, and comfortable riding experience. The 2004 FLSTF represented a refined iteration of this classic design.
Competitors:
Competed against other large-displacement cruiser motorcycles from brands like Indian, Victory, and some Japanese manufacturers offering similar styles.
Key Features:
Chrome-laden appearance, wide front tire, FL-style front end, classic Fat Boy styling cues, and the robust Twin Cam 88 engine.
Engine:
Detailed coverage of the Harley-Davidson Twin Cam 88 engine, including disassembly, assembly, inspection, and specifications.
Transmission:
Comprehensive information on the 5-speed transmission, including removal, installation, clutch service, and gear inspection.
Fuel System:
Diagnosis and repair procedures for the fuel injection system, fuel pump, fuel filter, and fuel tank.
Electrical System:
In-depth coverage of the ignition system, charging system, lighting, starting system, and all electronic components, including wiring diagrams.
Brakes:
Service and repair of the hydraulic braking system, including front and rear brake caliper service, master cylinder, and brake fluid specifications.
Suspension:
Detailed procedures for front fork service, rear shock absorber replacement, and suspension adjustments.
Frame And Bodywork:
Information on frame inspection, body panel removal and installation, fenders, and mounting hardware.
Wheels And Tires:
Tire pressure recommendations, wheel bearing service, and spoke tensioning procedures.
Exhaust System:
Maintenance and replacement of the exhaust system components.
Maintenance:
Routine scheduled maintenance, fluid changes, filter replacements, and inspections.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting for common mechanical and electrical issues.
Repair:
Step-by-step instructions for disassembly, repair, and reassembly of all major motorcycle components.
Diagnostics:
Diagnostic procedures for engine, electrical, and fuel system issues.
Adjustments:
Procedures for clutch adjustment, throttle cable adjustment, and suspension settings.
Depth:
Comprehensive, covering basic to advanced diagnostics and repair procedures, suitable for professional technicians and experienced DIY mechanics.
Engine Type:
Air-cooled, Twin Cam 88 V-twin
Displacement:
1449 cc (88 cubic inches)
Bore X Stroke:
3.75 in x 4.00 in (95.25 mm x 101.6 mm)
Valve Train:
Overhead valves (OHV), pushrod actuated, two valves per cylinder
Horsepower:
Approximately 65 HP (rated at crankshaft, actual wheel horsepower lower)
Torque:
Approximately 75 ft-lbs @ 3200 RPM
Fuel Delivery:
Electronic Fuel Injection (EFI)
Fuel Type:
Unleaded gasoline, minimum 91 octane (AKI)
Oil Capacity:
3.5 US quarts (3.3 liters) with filter change
Oil Type:
Harley-Davidson Genuine V-Twin 20W-50 Synthetic (or equivalent meeting Harley-Davidson specification)
Transmission Type:
5-speed constant mesh, manual
Clutch Type:
Wet, multi-plate, manual activation
Primary Drive:
Duplex chain, 34/46 teeth
Final Drive:
Belt drive, 32/66 teeth
Transmission Fluid Type:
Harley-Davidson Genuine Formula + (or equivalent)
Transmission Fluid Capacity:
2.7 US quarts (2.6 liters)
Length:
93.5 in (2375 mm)
Height:
49.0 in (1245 mm)
Wheelbase:
63.7 in (1618 mm)
Dry Weight:
668 lbs (303 kg)
Gross Vehicle Weight Rating Gvwr:
1160 lbs (526 kg)
Fuel Tank Capacity:
5.0 US gallons (18.9 liters)
Front Tire Size:
130/90-16
Rear Tire Size:
130/90-16
Front Wheel Type:
Steel, 16-inch laced, chrome
Rear Wheel Type:
Steel, 16-inch laced, chrome
Wheelbase:
63.7 in (1618 mm)
Infotainment System:
Base model, typically no integrated infotainment system beyond the speedometer and basic indicator lights. Aftermarket audio systems were common.
Driver Assistance Features:
No electronic driver assistance features like ABS or traction control were standard on this model in 2004. ABS was an optional add-on.
Initial Service:
Typically at 1,000 miles (1,600 km) or 3 months, whichever comes first.
Regular Maintenance:
Scheduled maintenance every 5,000 miles (8,000 km) or 12 months, including oil and filter changes, inspections, and adjustments. Specific intervals for other components like spark plugs, transmission fluid, and brake fluid are detailed in the manual.
Engine Oil:
Harley-Davidson Genuine V-Twin 20W-50 Synthetic
Transmission Fluid:
Harley-Davidson Genuine Formula + (or equivalent)
Primary Chain Case Oil:
Harley-Davidson Genuine Formula + (or equivalent)
Brake Fluid:
DOT 4 hydraulic brake fluid (ensure it meets Harley-Davidson specifications)
Common Issues 2004 Fat Boy:
Potential issues can include cam chain tensioner wear (especially on earlier Twin Cam models, though improved by 2004), occasional electrical gremlins, and normal wear and tear on clutch and brake components. The manual will provide guidance on diagnosing and addressing these.
Oil Filter:
Typically Harley-Davidson part number 63731-37B or equivalent
Brand Heritage:
Harley-Davidson, founded in 1903, is one of the most recognized and iconic motorcycle manufacturers in the world, synonymous with American freedom and lifestyle.
Model Evolution:
The Fat Boy model, introduced in 1990, quickly became a popular cruiser. The 2004 model continued the legacy with the Twin Cam 88 engine, representing a significant technological update for the iconic design.
Production Period:
The FLSTF Fat Boy has been in continuous production since 1990, with various engine updates and stylistic refinements over the years.
