Market Position:
The Harley-Davidson Dyna series represented a classic American cruiser, known for its raw V-twin character, manageable size, and customizability. This manual serves owners and technicians who value maintaining and repairing these iconic motorcycles.
Competition:
Competed with other American V-twin cruisers and some Japanese interpretations of the cruiser segment, emphasizing distinctive styling and a robust riding experience.
Key Features:
Focus on the Big Twin engine, characteristic Harley-Davidson sound and feel, and a blend of classic and modern styling for the era.
Engine Service:
Engine assembly, disassembly, tuning, diagnostics, oil pump, ignition system, fuel injection, carburetor (if applicable), cooling system
Transmission Service:
Gearbox removal, installation, internal components, clutch, primary drive, final drive
Electrical System:
Wiring diagrams, lighting, charging system, starting system, battery, ignition, diagnostic codes (DTCs), instrumentation, switches, relays, sensors
Chassis Suspension And Steering:
Front fork, rear shocks, swingarm, bearings, steering head, wheel alignment
Braking System:
Front and rear brakes, hydraulic systems, calipers, rotors, master cylinders, bleeding procedures, ABS (if equipped)
Fuel System:
Fuel tank, fuel lines, fuel pump, fuel injectors, fuel pressure regulator, EVAP system
Exhaust System:
Mufflers, pipes, catalytic converters, O2 sensors
Body And Frame:
Frame inspection, body panels, fairings, fenders, seat, handlebars, controls
Routine Maintenance:
Oil changes, filter replacements, spark plug replacement, chain adjustment, brake pad inspection
Diagnostic Troubleshooting:
Step-by-step guides for identifying and resolving common and uncommon issues, fault code interpretation
Component Repair And Rebuild:
Detailed instructions for disassembling, inspecting, repairing, and reassembling all major and minor vehicle components
Wiring And Electrical Diagnostics:
Reading wiring diagrams, testing circuits, component replacement, troubleshooting electrical faults
Depth:
Comprehensive, covering everything from basic adjustments to complete engine and transmission rebuilds. Includes detailed specifications, torque values, and special tool requirements.
Engine Family:
Harley-Davidson Twin Cam 88
Engine Configuration:
Air-cooled, 45-degree V-twin
Displacement:
1449 cc (88 cubic inches)
Bore X Stroke:
3.75 in. x 3.25 in. (95.25 mm x 82.55 mm)
Horsepower Estimated:
Approx. 65-70 HP (at crankshaft)
Torque Estimated:
Approx. 85-90 lb-ft (at crankshaft)
Fuel Delivery:
Fuel Injection (Sequential Port Electronic Fuel Injection - ESPFI) or Carbureted (Keihin CV 40mm, depending on specific model variant)
Fuel Type:
Unleaded Gasoline, 87 octane minimum
Oil Type:
Harley-Davidson Genuine V-Twin Oil SAE 20W50 or equivalent motorcycle-specific oil
Oil Capacity With Filter:
Approx. 3.0 US quarts (2.8 L)
Wheelbase:
Approx. 64.2 - 65.7 inches (1630 - 1670 mm) depending on model
Length:
Approx. 90-93 inches (2286-2362 mm) depending on model
Dry Weight:
Approx. 620 - 650 lbs (281 - 295 kg) depending on model
Gvwr:
Approx. 950 - 1000 lbs (431 - 454 kg) depending on model
Front Tire:
e.g., MT90B16 / 130/90B16 73H BW
Rear Tire:
e.g., MU85B16 77H BW
Wheel Type:
Cast aluminum or Steel laced, depending on model
Wheel Bolt Pattern:
N/A (Single-sided hub, lug mounting)
Crash Test Ratings:
N/A (Motorcycle safety is not rated by agencies like NHTSA in the same way as cars)
Braking:
Dual disc front brakes, single disc rear brake. ABS was optional on some 2007 models.
Lighting:
Halogen headlight, LED tail light, turn signals
Frame Construction:
Steel frame, designed for stability and rider feedback
Rider Control:
Ergonomic handlebar and control placement for rider confidence
Instrumentation:
Analog speedometer, tachometer (on some models), odometer, trip meters, fuel gauge, and warning lights. Some models may have an optional infotainment system.
ABS:
Anti-lock Braking System (ABS) was an optional feature on select 2007 Dyna models.
Diagnostic Ports:
Proprietary diagnostic port for use with Harley-Davidson diagnostic tools (e.g., Digital Technician).
First Service Mileage:
1000 miles (1600 km)
Subsequent Service Mileage:
Every 5000 miles (8000 km) thereafter, or annually, whichever comes first.
Fork Oil:
Harley-Davidson Suspension Fluid (or equivalent SAE 15W) - check manual for specific model and fork type quantities.
Brake Fluid:
DOT 4, Castrol GTX High Performance DOT 4 or equivalent.
Twin Cam 88 Wear:
Early Twin Cam engines could experience cam chain tensioner wear. Replacement with updated, more robust tensioners (hydraulic or from later Twin Cam versions) is a common upgrade discussed in forums and service bulletins.
Crankcase Issues:
Potential for crankcase cracking at the breather vent or oil filter mounting area on some early Twin Cam models, though less prevalent by 2007.
Electrical Gremlins:
As with many complex motorcycles, occasional electrical issues can arise. The manual's detailed wiring diagrams are crucial for diagnosis.
Brand Heritage:
Harley-Davidson, founded in 1903, is an iconic American motorcycle manufacturer renowned for its V-twin engines, distinctive styling, and a strong community of riders. The brand embodies freedom, individuality, and a rich motorcycling culture.
Dyna Lineage:
The Dyna line, introduced in 1991, served as a bridge between the older Shovelhead/Evolution Big Twins and the later Twin Cam platform. It featured a rubber-mounted engine for reduced vibration compared to earlier rigid-mounts, offering a balance of classic feel and modern comfort. The 2007 models were part of the Twin Cam 88 era before the introduction of the Twin Cam 96.
Manufacturing Location:
Milwaukee, Wisconsin, USA (and various other Harley-Davidson facilities)
