Category:
Cruiser Motorcycle
Target Audience:
Harley-Davidson FXDB Dyna owners and independent repair shops specializing in American V-twin motorcycles.
Key Competitors:
While the FXDB Dyna is a unique platform, its competitors in the cruiser segment of this era included models from Indian, and to some extent, larger displacement offerings from Japanese manufacturers with similar styling cues.
Platform Focus:
The Dyna platform emphasized a blend of traditional Harley-Davidson character with more modern handling and ride characteristics compared to earlier Big Twin models.
Applicable Years:
1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
Type:
Workshop Service Repair Manual
Engine Service:
Complete engine overhaul, disassembly, assembly, tuning, and diagnostics for Twin Cam 88 and Evolution Big Twin variants prevalent during this era.
Transmission Service:
Service and repair of the 5-speed Cruise Drive transmission, including clutch, primary drive, gearbox maintenance, and troubleshooting.
Electrical System:
Comprehensive coverage of the motorcycle's electrical system, including battery, charging system, ignition, lighting, starter, and accessory circuits, with detailed wiring diagrams.
Chassis And Suspension:
Detailed procedures for front fork (e.g., Showa or similar OEM specification) overhaul, rear shock absorber service, steering head bearing maintenance, and frame inspection.
Braking System:
Service and repair of hydraulic braking systems, including front and rear brake calipers, master cylinders, brake lines, fluid changes, and bleeding procedures.
Fuel System:
Maintenance and troubleshooting of the fuel delivery system, including carburetor service (e.g., Keihin CV carburetor), fuel lines, petcock, and fuel tank inspection.
Exhaust System:
Information on the stock exhaust system, including mounting, gasket replacement, and inspection for leaks or damage.
Body And Trim:
Procedures for removing and installing body panels, fenders, fuel tank, seat, and other cosmetic components.
Routine Maintenance:
Oil changes, filter replacements, spark plug service, chain adjustment (if applicable to specific Dyna models within the range), brake fluid flush, and general inspection checklists.
Troubleshooting:
Diagnostic flowcharts and common problem identification for engine, electrical, and mechanical issues.
Rebuilding And Overhaul:
Detailed step-by-step instructions for major component overhauls, including engine internals, transmission components, and suspension units.
Torque Specifications:
Comprehensive list of all essential torque values for fasteners across all major assemblies.
Special Tools:
Identification and usage instructions for specialized Harley-Davidson tools required for specific repairs and diagnostics.
Depth:
Comprehensive coverage from basic maintenance and scheduled servicing to in-depth engine, transmission, and electrical system diagnostics and repair, suitable for both home mechanics and professional technicians.
Engine Family:
Evolution Big Twin (also known as Twin Cam 88 in later models within this range, though early 1991 models might still carry Evolution branding or a transition) and later introduction of Twin Cam 88B (counter-balanced Evolution).
Engine Type:
Air-cooled, 45-degree V-twin
Displacement Cc:
1340cc (82 cubic inches) for Evolution Big Twin, 1450cc (88 cubic inches) for Twin Cam 88 variants introduced during the period.
Horsepower Estimate:
Approximately 60-70 HP (varies by year and specific engine configuration, figures are estimates for stock engines).
Torque Estimate:
Approximately 70-85 ft-lbs (varies by year and specific engine configuration, figures are estimates for stock engines).
Fuel Delivery:
Carbureted, typically Keihin 40mm CV (Constant Velocity) carburetor for Evolution engines. Twin Cam 88 models may utilize updated carburetors or early fuel injection systems depending on specific sub-models and year.
Ignition Type:
Electronic ignition system, often with adjustable timing.
Oil System:
Dry Sump lubrication system with oil tank typically integrated into the frame or rear section.
Wheelbase Mm:
Approx. 1560-1610 mm (61.5-63.4 inches), depending on specific model and year.
Seat Height Mm:
Approx. 700-740 mm (27.5-29.1 inches), depending on suspension setup and seat type.
Dry Weight Kg:
Approx. 260-280 kg (573-617 lbs), depending on specific model and equipment.
Fuel Capacity Liters:
Approx. 17-19 Liters (4.5-5.0 US gallons), typically a 3.5-gallon tank with a reserve.
Safety Features Note:
Motorcycles of this era typically did not have formal safety ratings like cars. Safety features are primarily mechanical and rider-controlled.
Braking System:
Dual hydraulic disc brakes (front and rear) with single or dual calipers depending on year and model specification.
Lighting:
Halogen headlight, tail light, brake light, and turn signals for visibility.
Frame Construction:
Steel frame designed for stability and rider feedback.
Tire Specifications:
Bias-ply or radial tires appropriate for cruiser applications. Specific sizes vary but commonly include 16-inch front and rear wheels.
First Service Km:
Typically at 1,000 miles (1,600 km) for initial break-in service.
Regular Oil Change Km:
Every 2,500 - 5,000 miles (4,000 - 8,000 km) or annually, depending on usage and oil type. Consult manual for precise recommendations.
Brake Fluid Flush Interval Years:
Typically every 1-2 years.
Engine Oil Type:
Harley-Davidson 20W-50 or equivalent V-twin motorcycle specific oil (e.g., SYN3 for Harley-Davidson, or high-quality mineral/synthetic 20W-50).
Transmission Oil Type:
Harley-Davidson Formula+ or equivalent primary chaincase lubricant.
Brake Fluid Type:
DOT 4 or DOT 5.1 hydraulic brake fluid (check specific model requirements, some earlier models might specify DOT 5 Silicone fluid, but DOT 4/5.1 is more common for general service).
Fork Oil Type:
Harley-Davidson Type E (equivalent to SAE 10W) or Type B (equivalent to SAE 15W) fork oil, depending on desired damping characteristics and model specification.
Cam Chain Tensioners:
Early Evolution Big Twins are known for hydraulic cam chain tensioners that can wear out and cause noise or potential damage if not maintained. Twin Cam 88 engines also have tensioner wear concerns.
Carburetor Tuning:
Keihin CV carburetors can require periodic adjustment and jetting for optimal performance, especially after modifications or altitude changes.
Electrical Connections:
As with many motorcycles of this age, some electrical connectors may degrade over time, leading to intermittent issues if not inspected and maintained.
Manufacturer:
Harley-Davidson Motor Company, founded in 1903.
Dyna Platform Introduction:
The Dyna chassis was introduced in 1991, offering a blend of traditional Harley Big Twin feel with improved rigidity and handling over older frames. The FXDB Dyna Super Glide was one of the initial models in this platform.
Engine Transition:
This period saw the transition from the Evolution Big Twin engine (1340cc) to the introduction of the counter-balanced Twin Cam 88B engine in later models within this range, offering smoother operation.
Manufacturing Location:
Primarily manufactured in the United States.
Model Recognition:
The Dyna platform itself gained recognition for its robust construction and the distinctive Harley-Davidson riding experience. Specific awards for the FXDB Dyna variant are less common than for overall model lines.
Reliability Reputation:
Generally regarded as a solid performer within the Harley-Davidson lineup, with many units still in service. Reliability is heavily dependent on proper maintenance and care.
Emissions Certification:
Compliant with US EPA and California Air Resources Board (CARB) emissions standards for the respective model years.
