Segment:
Cruiser Motorcycle
Target Audience:
Harley-Davidson FLSTF Fat Boy owners, independent mechanics, enthusiast restorers.
Value Proposition:
Provides essential, detailed information for maintaining and repairing the iconic Fat Boy, saving significant costs compared to dealership service.
Iconic Design:
The Fat Boy is renowned for its distinctive fat tires, wide forks, and chrome accents, representing a classic American motorcycle aesthetic.
Robust Engine:
Features the reliable Harley-Davidson Evolution Big Twin engine, known for its torque and longevity.
Engine Mechanical:
Complete teardown, inspection, rebuilding of Evolution Big Twin engine (1340cc).
Engine Performance:
Carburetor tuning and adjustment, ignition timing, compression testing.
Transmission Drivetrain:
5-speed constant mesh gearbox, primary drive system, belt final drive.
Electrical Diagnostics:
Wiring diagrams, charging system, ignition system, lighting, starting system, accessories.
Suspension And Steering:
Front fork (hydraulic), rear shock absorbers, steering head bearing adjustment.
Braking System:
Front and rear disc brakes, hydraulic system, caliper servicing, brake fluid specifications.
Fuel And Emissions:
Keihin CV carburetor (or equivalent), fuel tank, fuel lines, emissions control (where applicable).
Routine Maintenance:
Oil changes, filter replacement, spark plug inspection/replacement, chain adjustment.
Major Repairs:
Engine rebuilds, transmission overhaul, fork seal replacement, wheel bearing service.
Troubleshooting Guides:
Systematic diagnosis of common problems with step-by-step solutions.
Component Disassembly Reassembly:
Detailed instructions for taking apart and putting back together all major vehicle components.
Torque Specifications:
Precise torque values for all fasteners to ensure proper assembly.
Depth:
Comprehensive coverage from basic maintenance to full engine and transmission overhauls.
Engine Type:
Harley-Davidson Evolution (Shovelhead successor)
Engine Displacement:
1340cc (81.8 cubic inches)
Bore X Stroke:
3.494 in. x 4.250 in. (88.7 mm x 108.0 mm)
Compression Ratio:
8.8:1 (typical)
Cooling Method:
Air-cooled
Cylinder Configuration:
V-twin, 45-degree cylinder angle
Valvetrain:
Overhead valve (OHV), two valves per cylinder
Engine Oil Capacity:
3.5 US quarts (3.3 liters)
Horsepower Estimate:
~60 hp @ 5000 RPM (approximate, varies with tune)
Torque Estimate:
~70 ft-lbs @ 3000 RPM (approximate, varies with tune)
Carburetor Model:
Keihin CV (Constant Velocity) 40mm
Fuel Type:
Unleaded gasoline, minimum 87 octane
Ignition Type:
Electronic ignition (points may be present on earlier variations, but typically electronic by 1997)
Safety Standards:
Designed to meet relevant motorcycle safety standards of the era.
Braking System Type:
Hydraulic disc brakes, front and rear.
Suspension Compliance:
Provides stable handling and road holding.
Frame Construction:
Steel frame designed for rigidity and rider control.
Lighting Visibility:
Standard headlamp, tail lamp, turn signals for visibility.
Initial Service Mileage:
1000 miles (1600 km)
Subsequent Oil Change Interval:
Every 2500-5000 miles (4000-8000 km) or annually, depending on usage.
Belt Tension Check Interval:
Every 2500 miles (4000 km)
Spark Plug Replacement Interval:
Inspect every 5000 miles (8000 km), replace as needed.
Engine Oil Type:
Harley-Davidson Genuine V-Twin 20W-50 or equivalent meeting HD-360 specification.
Primary Chain Case Fluid:
Harley-Davidson Genuine Formula + (or equivalent meeting spec), SAE 50.
Brake Fluid Type:
DOT 4 hydraulic fluid.
Fork Oil Type:
Harley-Davidson Screamin' Eagle Type E Fork Oil or equivalent, viscosity appropriate for front suspension tuning.
Carburetor Tuning:
CV carburetor may require periodic adjustment for optimal performance, especially with altitude or modification changes.
Belt Drive Wear:
The belt drive requires proper tensioning to prevent premature wear. Inspection for cracks or damage is essential.
Rear Wheel Alignment:
Proper alignment of the rear wheel with the belt drive is critical for longevity.
Valve Adjustment:
While hydraulic lifters are used, valve lash adjustment might be necessary over time, especially if solid lifters are retrofitted.
Brand Origin:
Founded in Milwaukee, Wisconsin, USA in 1903, Harley-Davidson is one of the most iconic American motorcycle manufacturers.
Fat Boy Introduction:
The FLSTF Fat Boy was introduced in 1990, quickly becoming a cultural icon, notably featured in the film 'Terminator 2: Judgment Day'.
Evolution Engine:
The Evolution engine, introduced in 1984, was a significant technological advancement for Harley-Davidson, offering improved reliability and performance.
Manufacturing Location:
United States
Model Significance:
The 1997-1998 models represent a mature iteration of the Fat Boy, powered by the robust 1340cc Evolution engine before the transition to the Twin Cam 88.
Cultural Impact:
Recognized as a pop culture icon due to its prominent role in 'Terminator 2' and its distinctive styling.
Motorcycle Reviews:
Consistently praised for its classic styling, comfortable riding position, and the character of its V-twin engine.
Manufacturer Certification:
Produced under Harley-Davidson's stringent manufacturing and quality control standards.
