Category:
Collector's Motorcycle / Classic American Cruiser
Target Audience:
Harley-Davidson Duo Glide 1967 owners, restorers, mechanics, and enthusiasts
Competition:
Other large-displacement American V-twins of the era, such as Indian Chief (though Indian was winding down).
Vehicle Design:
Iconic V-twin cruiser design, comfortable touring posture, historically significant model in Harley-Davidson's evolution.
Manual Value:
Essential resource for maintaining the originality and functionality of a vintage Harley-Davidson.
Powertrain:
Engine, transmission, final drive
Chassis:
Frame, suspension (front fork, rear shocks), steering, wheels, brakes
Electrical:
Ignition system, lighting, battery, charging system, instruments
Fuel System:
Carburetion (e.g., Linkert), fuel tank, fuel lines
Bodywork:
Fenders, fuel tank, seat, saddlebags (if equipped), controls
Maintenance:
Routine checks, lubrication, adjustments, filter replacement
Troubleshooting:
Diagnostic charts and procedures for common problems
Repair:
Detailed disassembly, assembly, and repair steps for all major components
Installation:
Procedures for installing new parts or sub-assemblies
Depth:
Comprehensive rebuild procedures, factory specifications, torque values, and clearances
Format Details:
Printed, bound manual for durability and ease of use in a workshop environment
Quality:
High-quality paper with clear diagrams and text for readability
Binding:
Likely a durable saddle-stitch or perfect binding for workshop use
Paper Stock:
Durable paper stock suitable for workshop environments, potentially with a matte finish to reduce glare
Type:
Air-cooled, four-stroke, 45-degree V-twin
Displacement:
74 cubic inches (1208cc)
Bore X Stroke:
3.4375 in x 4.25 in (87.3 mm x 108.0 mm)
Compression Ratio:
Approximately 7.0:1 (varies slightly by specific sub-model/tuning)
Horsepower:
Approximately 50-55 HP @ 5000 RPM (estimate, factory figures often not directly stated for this era)
Torque:
Not typically specified in peak HP/Torque figures for this era, but significant low-end torque.
Carburetor:
Linkert M-series (e.g., M-34 for Panhead, M-51 for Shovelhead variants if applicable to late '67 models)
Fuel Type:
Unleaded gasoline (with appropriate octane rating for the era, typically 90-95 RON)
System:
Battery and coil ignition with points and condenser
System:
Wet-sump lubrication system
Type:
4-speed constant mesh manual transmission
Optional Features:
Foot clutch and hand shift lever (standard), suicide clutch (earlier models, phased out but may be present on custom builds)
Clutch Type:
Wet, multi-plate
Gear Ratios:
Detailed ratios provided in the manual for each gear
Final Drive:
Chain drive (primary and final)
Wheelbase:
Approximately 61.5 inches (1562 mm)
Length:
Approximately 90 inches (2286 mm)
Seat Height:
Approximately 29 inches (737 mm) (unladen)
Dry Weight:
Approximately 550-600 lbs (250-270 kg) depending on accessories
Gross Vehicle Weight Rating:
Not typically a defined GVWR for this era of motorcycle, but rated for rider and passenger comfort.
Front Tire Size:
3.00-18 (typical)
Rear Tire Size:
4.00-18 (typical)
Wheel Bolt Pattern:
Not applicable (spoked wheels with axles)
Crash Safety Ratings:
Not applicable (motorcycles of this era did not undergo standardized crash testing as modern cars do)
Braking System:
Drum brakes (front and rear)
Lighting:
Headlight, taillight, brake light, turn signals (if equipped), indicator lights
Frame Construction:
Steel frame for structural integrity
System:
Basic instrumentation: speedometer, ammeter, oil pressure light (if equipped), neutral indicator.
Features:
None (no electronic driver assistance systems)
Features:
None (mechanical systems only)
Headlight Type:
Halogen (likely upgraded from original sealed beam if replaced)
Oil Change:
Typically every 1,000 - 1,500 miles (specific interval in manual)
Tune Up:
Recommended at 2,500 - 5,000 miles, including ignition timing, carburetor adjustment, valve lash adjustment.
Engine Oil:
SAE 50 (or SAE 20W-50 for modern equivalent, specific recommendation in manual) – typically Harley-Davidson's proprietary blend or equivalent.
Transmission Oil:
SAE 50 or SAE 60 gear oil (specific recommendation in manual)
Primary Chain Case Oil:
Harley-Davidson primary chain lubricant or equivalent (specific grade and type in manual)
Engine Oil Capacity:
Approximately 4 quarts (3.8 L)
Transmission Oil Capacity:
Approximately 1 pint (0.47 L)
Engine:
Valve guide wear, oil leaks (common with vintage engines), cam follower wear, potential for oil pressure issues if not maintained.
Transmission:
Worn shifting collars, engagement dogs, and clutch components.
Electrical:
Aging wiring harnesses, failing regulators/generators, contact point issues in ignition.
Carburetor:
Linkert carburetors can be finicky; require precise adjustment and clean internals.
Air Filter Element:
Specific part number would be detailed in the manual.
Oil Filter:
Not applicable for models with total loss oiling; oil is typically not filtered externally on this vintage of Panheads.
Brand Foundation:
Founded in Milwaukee, Wisconsin, in 1903, one of the oldest motorcycle manufacturers.
Predecessors:
Evolved from the Hydra-Glide and the original Duo-Glide models, marking a significant step in Harley-Davidson's touring bike development.
Successors:
Led to the development of the Electra Glide, becoming the flagship touring model.
Engine Lineage:
Panhead OHV V-twin engine (prevalent in early '67 models), transitioning to early Shovelhead OHV V-twin later in '67 and subsequent years. Manual will cover the specific engine fitted.
Manufacturing Location:
Milwaukee, Wisconsin, USA
Historical Significance:
Considered an iconic American motorcycle, a staple of the Harley-Davidson touring line, and a sought-after classic for collectors.
Vintage Motorcycle Value:
High collector value, dependent on condition, originality, and provenance.
Manual Certification:
Factory Certified (as it is an original factory service manual)
