Market Segment:
Cruiser Motorcycle Segment
Competitors 2015:
Indian Chief, Victory Cross Country, other Harley-Davidson models (Softail, Sportster), various Japanese cruisers.
Platform Identity:
Dyna models are known for their traditional cruiser styling, comfortable riding position, and V-twin engine character.
Engine:
Comprehensive coverage of the Twin Cam 103 engine, including disassembly, assembly, tuning, and troubleshooting.
Transmission:
Detailed procedures for the 6-speed Cruise Drive transmission, including clutch, primary drive, and gearbox maintenance and repair.
Electrical System:
Extensive coverage of the electrical system, including wiring diagrams, component testing, diagnostic procedures, ignition system, charging system, lighting, and accessories.
Chassis And Suspension:
Repair and adjustment of front forks (e.g., Showa), rear shocks, swingarm, bearings, and related components.
Braking System:
Maintenance, troubleshooting, and repair of front and rear braking systems, including brake fluid replacement, caliper service, and ABS system (if equipped).
Fuel System:
Information on fuel injection system (EFI), fuel pump, injectors, throttle body, and related sensors.
Exhaust System:
Details on exhaust pipe removal, installation, and common maintenance.
Wheels And Tires:
Specifications and procedures for wheel removal, installation, tire changes, and balancing.
Routine Maintenance:
Scheduled maintenance tasks, oil changes, filter replacements, lubrication points, and general inspections.
Troubleshooting:
Step-by-step diagnostic guides for common and complex issues, fault code interpretation.
Disassembly And Assembly:
Complete instructions for dismantling and reassembling major vehicle components.
Repair And Rebuild:
Detailed instructions for repairing or rebuilding engine, transmission, and other major assemblies.
Electrical Diagnostics:
Testing of electrical components, circuits, and systems using multimeters and diagnostic tools.
Depth Level:
Comprehensive, from basic user maintenance to advanced engine rebuilds and electrical diagnostics, suitable for professional mechanics and experienced DIY enthusiasts.
Engine Type:
Air-cooled, Twin Cam 103™ V-twin
Displacement:
1690 cc (103 cubic inches)
Bore X Stroke:
3.875 in. x 4.375 in. (98.4 mm x 111.1 mm)
Compression Ratio:
9.0:1 (typical for Twin Cam 103)
Torque:
Approximately 99.5 ft-lb (135 Nm) @ 3,500 RPM (varies slightly by specific Dyna model and tune)
Fuel Delivery:
Electronic Sequential Port Fuel Injection (ESPFI)
Fuel Type:
Premium unleaded gasoline
Oil Type:
Harley-Davidson recommends SYN3 synthetic motorcycle lubricant or equivalent SAE 20W50 motorcycle oil for engine, transmission, and primary chaincase (check manual for specific recommendations and drain/fill plugs).
Transmission Type:
6-speed Cruise Drive
Primary Drive:
In-line, chain drive
Final Drive:
Belt drive (70-tooth, 1.25-inch wide belt)
Transmission Oil Capacity:
Approximately 1 quart (0.95 L) (check manual for specific procedure and dipstick verification)
Primary Chain Case Oil Capacity:
Approximately 2.5 pints (1.2 L) (check manual for specific procedure and dipstick verification)
Wheelbase:
Varies by specific Dyna model (e.g., Low Rider, Street Bob, Switchback); typically around 63.0-64.2 inches (1600-1630 mm)
Dry Weight:
Varies by specific Dyna model; typically around 650-680 lbs (295-308 kg)
Gross Vehicle Weight Rating Gvwr:
Typically around 1000-1050 lbs (454-476 kg)
Crash Test Ratings:
Motorcycles are not typically rated by organizations like NHTSA or IIHS in the same way as cars; safety relies heavily on rider skill and active safety features.
Braking System:
Dual-piston front and rear disc brakes. Anti-lock Braking System (ABS) was an optional feature on many 2015 Dyna models.
Lighting:
Halogen headlight, LED tail light and brake light, amber incandescent turn signals.
Audio System:
Optional audio systems were available, often featuring analog radio and CD/MP3 player depending on the specific Dyna model and trim level. Many models had handlebar-mounted controls.
ABS:
Anti-lock Braking System (ABS) was an optional feature on many 2015 Dyna models. The manual will detail its operation and servicing.
Diagnostics:
On-board diagnostics (OBD-II equivalent for motorcycles) and diagnostic port for connecting specialized Harley-Davidson service tools (e.g., Digital Technician) are covered.
First Service:
Typically at 1,000 miles (1,600 km) for engine oil and filter change, primary chain adjustment, and general inspection. Subsequent services at 5,000-mile (8,000 km) intervals for oil changes, and more comprehensive checks every 10,000 miles (16,000 km).
Spark Plugs:
Inspect/replace typically every 10,000-15,000 miles (16,000-24,000 km).
Drive Belt:
Inspect for wear and proper tension at regular service intervals. Belt replacement depends on wear and mileage, often 30,000-60,000 miles (48,000-96,000 km).
Engine Oil:
Harley-Davidson SYN3 20W-50 Synthetic (recommended) or SAE 20W-50 Motorcycle Oil. Capacity approx. 4 quarts (3.8 L) with filter change.
Transmission Oil:
Harley-Davidson Transmission Fluid (e.g., SYN3 75W-90) or equivalent gear oil. Capacity approx. 1 quart (0.95 L).
Primary Chain Case Oil:
Harley-Davidson primary oil or SYN3 20W-50 Synthetic Motorcycle Oil. Capacity approx. 2.5 pints (1.2 L).
Brake Fluid:
DOT 4 Brake Fluid (check manual for specific application and type).
Common Wear Items:
Clutch plates, brake pads, tires, spark plugs, fork seals, and drive belt are common wear items.
Potential Faults:
Some models may experience issues with fuel tank seam leaks, exhaust header leaks, or sensor failures if not properly maintained. The manual will cover troubleshooting for these.
Brand Legacy:
Harley-Davidson has a long and storied history dating back to 1903, renowned for its V-twin engines and American cruiser motorcycle culture.
Dyna Lineage:
The Dyna platform, introduced in 1991, was known for its traditional styling, rubber-mounted engine for reduced vibration, and a more accessible ride compared to some of Harley's other platforms. It was eventually phased out in favor of the Softail platform in 2018.
Manufacturing Location:
Primarily manufactured in the United States.
