🏷️ Basic Information

Make:

Harley-Davidson

Model:

Dyna

Year:

2008

Platform:

Dyna (Fifth Generation)

👋 Introduction

Segment:

Cruiser Motorcycle

Target Audience:

Harley-Davidson Dyna owners and independent motorcycle mechanics

Key Competitors:

Indian Motorcycles (Chief, Scout), Triumph (Bonneville series), Japanese V-twins (e.g., Honda Shadow, Yamaha V-Star, Kawasaki Vulcan)

Vehicle Philosophy:

The Dyna series in 2008 represented Harley-Davidson's commitment to a more performance-oriented, modern take on the classic cruiser, emphasizing rider feedback and a more aggressive riding stance compared to the Softail line.

Manual Benefit:

This manual provides essential, up-to-date information for maintaining, repairing, and optimizing the 2008 Harley-Davidson Dyna motorcycle, ensuring longevity and peak performance.

📋 Manual Details

Coverage:

Routine Maintenance, Tune-up Procedures, Specifications, Troubleshooting, Repair, Overhaul, Electrical Systems, Engine, Transmission, Frame, Suspension, Brakes, Bodywork, Wiring Diagrams

Estimated Pages:

Approximately 800-1000 pages (typical for a comprehensive Harley-Davidson service manual of this era)

Type:

Service Repair Manual

Language:

English

Format:

Downloadable Digital File (likely PDF)

📖 Manual Coverage

Engine Systems:

Twin Cam 96 (1584cc) engine, carbureted and fuel-injected variants (if applicable for specific sub-models), ignition, fuel delivery, lubrication, cooling (air-cooled), exhaust

Drivetrain Systems:

5-speed Cruise Drive Transmission, primary drive, clutch, final drive (belt drive)

Chassis Systems:

Frame, front suspension (forks), rear suspension (shocks), wheels, tires, brakes (front and rear disc), steering

Electrical Systems:

Battery, charging system (alternator, regulator), ignition system, lighting, instrumentation, starter, horn, security system (if equipped), wiring diagrams for all circuits

Bodywork And Trim:

Fuel tank, fenders, seat, handlebars, controls, exhaust system, mounting hardware

Maintenance Procedures:

Oil changes, filter replacement, air filter service, spark plug replacement, chain/belt tensioning and lubrication, brake fluid flush, tire pressure checks, general inspection

Repair Procedures:

Engine rebuild (top-end and bottom-end), transmission overhaul, clutch replacement, brake caliper service, fork seal replacement, shock absorber replacement, electrical component diagnosis and replacement

Troubleshooting Guides:

Step-by-step diagnostic procedures for common and uncommon issues, fault code interpretation (for fuel-injected models)

Depth:

Comprehensive. Covers basic servicing, routine maintenance, detailed component disassembly and reassembly, diagnostics, and specifications for professional repair.

📊 Manual Specifications

File Type:

PDF

Searchability:

Text-searchable for quick information retrieval

Printability:

Printable pages for physical reference

Illustration Quality:

High-resolution illustrations, diagrams, and photographs

Binding:

N/A (Digital Download)

Paper Quality:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Family:

Harley-Davidson Twin Cam 88B (discontinued) replaced by Twin Cam 96 in most 2007+ models, but 2008 Dyna often features Twin Cam 96

Engine Displacement:

96 cubic inches (1584 cc)

Engine Configuration:

45-degree V-twin, air-cooled

Bore X Stroke:

3.75 in. x 4.38 in. (95.25 mm x 111.25 mm)

Compression Ratio:

9.2:1

Claimed Horsepower:

Approximately 70-75 HP (at crank, depending on specific model and tuning)

Claimed Torque:

Approximately 85-90 lb-ft (at crank, depending on specific model and tuning)

Fuel Delivery:

Electronic Sequential Port Fuel Injection (ESPFI) for most models, carburetor (e.g., Keihin CV) for some variants.

Fuel Type:

Unleaded gasoline, minimum 87 octane

Oil Type:

Harley-Davidson Genuine V-Twin Synthetic (or equivalent API SG, JASO MA rated 20W-50)

Oil Capacity:

Approximately 4 quarts (3.8 liters) with filter change

🔧 Transmission

Transmission Type:

5-speed Cruise Drive

Gear Ratios:

1st: 9.312, 2nd: 6.650, 3rd: 4.974, 4th: 3.737, 5th: 3.150 (approximate, may vary slightly)

Primary Drive:

6th gear compensated in primary chain drive

Final Drive:

Belt Drive, 32/66 ratio

Clutch Type:

Wet, multi-plate

Transmission Fluid:

Harley-Davidson Formula + (or equivalent SAE 50 transmission lubricant)

Transmission Fluid Capacity:

Approximately 2.8 quarts (2.6 liters)

📐 Dimensions

Wheelbase:

Approximately 63.5 - 64.5 inches (1613 - 1638 mm), model dependent (e.g., Super Glide, Street Bob, Fat Bob)

Dry Weight:

Approximately 650 - 670 lbs (295 - 304 kg), model dependent

Gross Vehicle Weight Rating:

Typically around 1000 lbs (454 kg)

🛡️ Safety Features

Crash Test Ratings:

N/A (Motorcycles typically do not undergo standardized crash testing like cars)

Braking System:

Dual disc front brakes, single disc rear brake with hydraulic actuation. Caliper types vary by sub-model (e.g., dual piston).

Tires Front:

Typically 16-inch or 19-inch, e.g., MT90B16 or MH90-21

Tires Rear:

Typically 16-inch, e.g., MU85B16

Lighting:

Halogen headlamp, LED or incandescent tail/stop lamps, turn signals.

Security:

Factory-installed H-D Smart Security System (optional or standard depending on trim) with proximity-based fob.

💡 Technology Features

Audio System:

Optional audio systems were available on some Dyna models (e.g., Wide Glide, Super Glide Custom), typically featuring AM/FM radio and CD player or MP3 input.

Instrumentation:

Analog speedometer, tachometer, fuel gauge, oil pressure indicator, voltmeter, and indicator lamps. Some models featured an electronic odometer and trip meter.

ABS:

Anti-lock Braking System (ABS) was an option on many 2008 Dyna models, providing enhanced braking stability.

Diagnostic Port:

Features a diagnostic connector for reading fault codes and performing system checks (especially for ESPFI models).

🔧 Maintenance

Initial Service:

First service at 1,000 miles (1,600 km) - includes oil change, filter change, primary chain adjustment, clutch inspection, general inspection.

Regular Oil Change:

Every 5,000 miles (8,000 km) or annually, whichever comes first.

Air Filter Service:

Inspect every 5,000 miles (8,000 km), replace as needed or every 10,000-15,000 miles (16,000-24,000 km).

Spark Plug Replacement:

Every 10,000 miles (16,000 km).

Brake Fluid Flush:

Every 2 years.

Engine Oil Spec:

Harley-Davidson Genuine V-Twin Synthetic 20W-50, API SG, JASO MA

Transmission Fluid Spec:

Harley-Davidson Formula +, SAE 50

Primary Chain Case Oil Spec:

Harley-Davidson Formula +, SAE 50 (same as transmission)

Cam Chain Tensioners:

The early Twin Cam engines (pre-2007) had a known issue with hydraulic cam chain tensioners. While the 2007+ models use improved tensioners, monitoring their condition is still advisable. This manual will cover inspection and replacement procedures.

Primary Drive Belt:

Regular inspection for wear, cracks, and proper tension is crucial. The manual details the correct tensioning procedures and belt replacement.

Suspension Leaks:

Front fork seals and rear shock absorbers can develop leaks over time. The manual provides detailed procedures for their inspection and replacement.

Electrical Connections:

Corrosion or loose connections can cause intermittent electrical faults. The manual's wiring diagrams are invaluable for troubleshooting these issues.

📚 Vehicle History

Brand Founding:

Founded in 1903 in Milwaukee, Wisconsin.

Dyna Introduction:

The Dyna line was introduced in 1991 as a successor to the Sturgis line, featuring a new frame and powertrain isolation system.

2008 Updates:

The 2008 model year marked the widespread adoption of the Twin Cam 96 engine and the Cruise Drive 6-speed transmission across the Dyna range, and for some models, the introduction of Electronic Sequential Port Fuel Injection (ESPFI) as standard.

Manufacturing Location:

Milwaukee, Wisconsin, USA (and other Harley-Davidson assembly plants)

🏆 Awards & Recognition

Motorcycle Of The Year:

While specific awards for the 2008 Dyna models are less common than general reviews, the Dyna platform consistently received positive reviews for its balance of performance and classic styling.

Professional Reviews:

Reviewers often praised the 2008 Dyna's improved engine performance with the Twin Cam 96, better handling due to the chassis refinements, and the overall rider experience.