Vehicle Market Segment:
Cruiser, specifically a custom-style motorcycle known for its iconic styling and V-twin engine.
Vehicle Target Audience:
Riders seeking a classic American motorcycle experience, characterized by relaxed cruising and distinctive styling.
Key Competitors:
Other V-twin cruisers from brands like Indian Motorcycle, Victory Motorcycles (though discontinued), and some Japanese manufacturers in the cruiser segment.
Iconic Design:
The Fat Boy is instantly recognizable by its wide front tire, distinctive chrome exhaust, Fat Ape handlebars, and teardrop fuel tank.
Engine Type:
Harley-Davidson's Twin Cam engine, renowned for its torque and characteristic V-twin rumble.
Ride Comfort:
Designed for comfortable long-distance cruising, with a relaxed riding position.
Diy Support:
Empowers owners to perform maintenance and repairs themselves, saving on labor costs and fostering a deeper connection with their machine.
Diagnostic Tool:
Essential tool for diagnosing and rectifying issues, ensuring optimal performance and longevity.
Restoration Guide:
Provides detailed information crucial for any restoration or customization projects.
Engine Systems:
Twin Cam 96 (1584cc) engine service, diagnosis, and repair, including fuel injection, ignition, cooling, lubrication, and exhaust systems.
Transmission Drivetrain:
6-speed Cruise Drive transmission service, clutch operation, primary drive, final belt drive, troubleshooting.
Chassis Suspension:
Front fork (39mm) and rear shock absorber service, frame inspection, wheel and tire maintenance, brake system overhaul (front and rear).
Electrical System:
Wiring diagrams, battery service, charging system (alternator/stator), starting system (starter motor), lighting, instrumentation, ignition system components.
Bodywork Fittings:
Fuel tank, fenders, seat, handlebars, controls, mirrors, saddlebags (if applicable), exhaust system installation and removal.
Maintenance Procedures:
Routine maintenance, oil changes, filter replacements, spark plug service, brake fluid flush, belt tension adjustment, inspection schedules.
Repair Procedures:
Engine disassembly and assembly, transmission rebuild, carburetor/fuel injection tuning, brake caliper overhaul, suspension component replacement.
Troubleshooting Diagnostics:
Systematic diagnostic charts, common problems and their solutions, fault code interpretation (if applicable).
Technical Specifications:
Torque specifications for all fasteners, fluid capacities, electrical specifications, performance data, part number references.
Diagnostic Capability:
Comprehensive diagnostic procedures, including symptom-based troubleshooting and component testing.
Rebuild Instructions:
Detailed step-by-step instructions for complete engine and transmission overhauls, suitable for professional mechanics and skilled DIYers.
Diagrams Illustrations:
Numerous exploded views, line drawings, wiring diagrams, and photographs to illustrate procedures and component identification.
Engine Type:
Twin Cam 96 (1584cc)
Engine Configuration:
Air-cooled, 45-degree V-twin
Bore X Stroke:
3.75 in. x 4.38 in. (95.25 mm x 111.25 mm)
Displacement:
96 cu in (1584 cc)
Torque:
Approx. 92.6 ft-lbs (125.5 Nm) @ 3500 RPM (typical for Twin Cam 96)
Horsepower:
Approx. 70-75 HP (typical for Twin Cam 96)
Fuel Delivery:
Electronic Sequential Port Fuel Injection (ESPFI)
Fuel Type:
Unleaded gasoline, minimum 91 octane
Ignition System:
High-performance, capacitor discharge ignition (CDI) with electronic spark control
Oil System:
Dry sump with oil tank located beneath the transmission
Oil Capacity:
3.5 US qt (3.3 L)
Recommended Oil:
Harley-Davidson SYN3 (20W-50 Full Synthetic) or equivalent API CI-4/CJ-4
Cooling Method:
Air-cooled
Transmission Type:
6-speed Cruise Drive
Gear Ratios:
1st: 9.311, 2nd: 6.454, 3rd: 4.792, 4th: 3.825, 5th: 3.167, 6th: 2.750 (Typical for 6-speed Cruise Drive)
Clutch Type:
Hydraulically actuated, multi-plate wet clutch
Final Drive:
Carbon fiber reinforced belt drive, 32/66 tooth ratio
Transmission Fluid Type:
Harley-Davidson Formula + Transmission Oil or equivalent SAE 50 API GL-1
Transmission Fluid Capacity:
24 US fl oz (0.71 L)
Safety Certifications:
DOT, EPA, CARB compliant (as applicable for street motorcycles)
Braking System:
Hydraulic disc brakes, front and rear. Dual front discs and single rear disc with 4-piston calipers.
ABS Availability:
Optional Anti-lock Braking System (ABS) available for 2008 models.
Lighting:
Halogen headlamp, LED tail lamp, front and rear turn signals, brake lights.
Chassis Stability:
Steel frame and rigid construction contributing to stable handling.
Instrumentation:
Analog speedometer, tachometer, fuel gauge, oil pressure warning light, and indicator lights.
Audio System:
Factory audio system was not standard on all 2008 FLSTF models; optional accessories were available.
Cruise Control:
Electronic cruise control was an optional feature available for certain configurations.
Diagnostic Ports:
Access to the diagnostic port (J1850 interface) for electronic diagnostic tools is covered.
First Service:
1,000 miles (1,600 km) or 6 months
Subsequent Service:
Every 5,000 miles (8,000 km) or 12 months, whichever comes first.
Engine Oil Viscosity:
20W-50 (Harley-Davidson SYN3 recommended)
Brake Fluid Type:
DOT 4 (refer to manual for specific Harley-Davidson recommendation)
Primary Chain Case Fluid:
Harley-Davidson Formula + Transmission Oil or equivalent SAE 50 API GL-1
Common Wear Items:
Clutch plates, brake pads, wheel bearings, belt tensioners, battery, and tires are common wear items.
Twin Cam Considerations:
While robust, Twin Cam engines can experience issues like cam chain tensioner wear (especially earlier models) and oil leaks if not properly maintained. The manual will guide on inspection and correction.
Electrical Diagnostics:
Wiring harnesses and electrical connectors require careful inspection for corrosion and proper seating, which the manual details.
Maintenance Schedule Detail
Spark Plugs:
Inspect/replace at 10,000 miles or as needed.
Drive Belt:
Inspect tension and condition every 5,000 miles, adjust as needed.
Fork Oil:
Inspect for leaks, replace as per mileage or fluid condition.
Brand Origin:
Founded in 1903 in Milwaukee, Wisconsin, Harley-Davidson is an iconic American motorcycle manufacturer with a rich heritage.
Fat Boy Introduction:
The Fat Boy model was first introduced in 1990, drawing inspiration from the bikes ridden by Arnold Schwarzenegger in the movie 'Terminator 2: Judgment Day'.
Softail Platform:
The FLSTF is part of the Softail family, characterized by its hidden rear suspension that mimics the rigid frame look of early motorcycles.
Production Location:
Harley-Davidson motorcycles are primarily manufactured in the United States.
Key Design Elements:
The 2008 model continues the Fat Boy's legacy with its substantial presence, chrome accents, and a focus on a classic V-twin cruiser aesthetic.
Model Acclaim:
The Fat Boy has consistently been recognized for its distinctive styling and comfortable cruiser ride, making it a perennial favorite in the Harley-Davidson lineup.
Brand Recognition:
Harley-Davidson motorcycles are globally recognized for their heritage, sound, and lifestyle associated with them.
Manual Quality:
This workshop manual adheres to industry standards for technical documentation, providing accurate and reliable information for service and repair.