Positioning:
The FXDF Fat Bob is a performance-oriented cruiser within Harley-Davidson's Dyna lineup, known for its aggressive styling and powerful engine.
Competitors:
Competes with other American V-twin cruisers and performance-oriented custom bikes.
Styling:
Dual front headlamps, fat front tire, chopped front fender, forward-mounted controls.
Engine Character:
Torque-rich Twin Cam 103 cubic inch V-twin, known for its low-end grunt.
Engine Mechanical:
Complete teardown, inspection, assembly, timing, lubrication
Fuel System:
Fuel injection (EFI), throttle body, fuel pump, injectors, fuel lines
Ignition System:
Spark plugs, coils, ignition module, crankshaft position sensor
Exhaust System:
Mufflers, headpipes, catalytic converter (if applicable), mounting hardware
Transmission Drivetrain:
Clutch, primary drive, transmission gears, final drive belt, shifter linkage
Electrical System:
Battery, charging system (stator, regulator/rectifier), starter, lighting, horn, accessories
Chassis Frame:
Frame inspection, steering head bearing, swingarm, shock absorbers, front forks
Braking System:
Front and rear brake calipers, master cylinders, brake lines, brake pads, brake fluid flush and bleed
Wheel Suspension:
Wheel bearing service, tire mounting and balancing, fork seal replacement, rear suspension adjustments
Bodywork Trim:
Fenders, fuel tank, seat, handlebars, controls, mirrors, exhaust heat shields
Diagnostics Troubleshooting:
Fault code interpretation, symptom-based troubleshooting guides
Wiring Diagrams:
Complete color-coded electrical schematics for all systems
Routine Maintenance:
Oil changes, filter replacements, belt tension checks, brake fluid checks, tire pressure adjustments
Major Repairs:
Engine rebuilding, transmission overhauls, fork seal replacement, brake system overhaul
Troubleshooting Guides:
Step-by-step diagnostics for common and uncommon issues
Disassembly Assembly:
Detailed instructions for component removal and reinstallation
Technical Specifications:
Torque values, clearances, fluid capacities, wiring pinouts
Depth:
Comprehensive, covering all aspects from basic maintenance to complete engine and transmission rebuilds.
Engine Type:
Air-cooled, Twin Cam 103 V-twin
Displacement:
103 cubic inches (1690 cc)
Bore X Stroke:
3.875 in. x 4.380 in. (98.4 mm x 111.3 mm)
Horsepower:
Approximately 70-75 HP (estimate, actual may vary by tune)
Torque:
Approximately 98-100 ft-lbs at ~3500 RPM (estimate, actual may vary by tune)
Fuel Delivery:
Electronic Sequential Port Fuel Injection (ESPFI)
Fuel Type:
Premium Unleaded Gasoline, minimum 91 octane
Oil Type:
Harley-Davidson SYN3 Full Synthetic Motorcycle Oil SAE 20W-50 or equivalent
Oil Capacity:
3.0 US qt (2.8 L) (with filter change)
First Service:
1,000 miles (1,600 km) or 6 months
Subsequent Service:
Every 5,000 miles (8,000 km) or 12 months thereafter
Engine Oil:
Harley-Davidson SYN3 Full Synthetic Motorcycle Oil SAE 20W-50
Transmission Primary Fluid:
Formula + Transmission and Primary Chaincase Lubricant
Brake Fluid:
DOT 4 (for models without ABS), DOT 5.1 (for models with ABS)
Final Drive Fluid:
Not Applicable (Belt Drive)
Potential Issues:
Crankshaft position sensor failure, clutch cable adjustment, exhaust pipe leaks, charging system issues (stator/regulator) can occur on older models or with aftermarket components. Regular maintenance is key.
Oil Filter:
Harley-Davidson OEM: 63731-09 (or equivalent aftermarket)
Heritage:
Harley-Davidson, founded in 1903, is a legendary American motorcycle manufacturer with a rich history in performance and customization.
Dyna Lineage:
The Dyna platform, introduced in 1991, is characterized by its rubber-mounted engine for reduced vibration and a more traditional custom look.
Fat Bob Introduction:
The Fat Bob name has been used for various Harley-Davidson models, with the modern FXDF being introduced in 2008 as part of the Dyna family, receiving the Twin Cam 103 engine in 2012.
Manufacturing Location:
United States
