8MM/2 INCH PRIMARY OPEN BELT DRIVE – KICK START – SPLINE SHAFT – 1955-1984 HARLEY-DAVIDSON BIG TWIN

Harley Open Belt Drive | The 8mm/2-inch primary open belt drive for kick-start, spline shaft-equipped 1955–1984 Harley-Davidson Big Twin motorcycles is a popular upgrade for riders looking to enhance their bike’s performance and aesthetics. This setup replaces the original chain-driven primary drive with a belt-driven system.

Features and Benefits | Buy Harley Open Belt Drive Online

1. Belt Specifications:
   • Size: The belt is 8mm pitch and 2 inches wide, providing increased surface area for better grip and torque transfer.
   • Material: Typically constructed from high-strength materials like Kevlar or fiberglass-reinforced rubber for durability and resistance to stretching.
2. Compatibility:
   • Models: Fits Harley-Davidson Big Twin models from 1955 to 1984, including Panheads, Shovelheads, and early Evolution engines.
   • Kick-Start: Designed specifically for bikes with a kick-start system, maintaining compatibility with the original kick-start mechanism.
   • Spline Shaft: Suitable for motorcycles with a spline shaft configuration in the primary drive.
3. Open Belt Drive Design:
   • Aesthetic Appeal: The open belt design exposes the belt and pulleys, giving the bike a classic chopper or bobber look.
   • Ease of Inspection and Maintenance: The open configuration allows for easier visual inspection of the belt and pulleys, making it easier to detect wear or damage.
4. Performance Enhancements:
   • Reduced Maintenance: Belts require no lubrication and less frequent adjustments compared to chain drives.
   • Improved Efficiency: Belts offer smoother and quieter operation than traditional chains, with less frictional loss.
   • Weight Reduction: Lighter than chain drive systems, potentially improving the motorcycle’s acceleration and handling.
5. Installation Considerations:
   • May require modifications to the primary cover or removal for the open design.
   • Proper alignment and tensioning of the belt are essential during installation to ensure reliable operation.
   • Upgrading to a heavy-duty clutch may be recommended for improved performance, especially on higher-torque engines.

This belt drive system is ideal for riders who want a vintage look and improved performance for their Harley-Davidson Big Twin.

BDL’s 8mm open belt drives have been around for many years. Most belt drive enthusiasts still think that these units are the best size and combination for all around riding and dependability. This drive adapts your stock clutch directly into the belt drive clutch basket, or you can upgrade your clutch to BDL’s Competitor clutch for 30% more clutch surface than stock. Fits 1955-1984 Harley-Davidson Big Twin kick start models with a splined shaft. See Additional Information below for fitment.

• All 8mm Kits Come With Belt, Clutch Basket, Front Pulley, Nut And Washer
• Pulley And Clutch Basket Are Hard Anodized Aluminum; Front Pulley Is Drilled And Tapped For Easy Removal
• Inner Clutch Hub And Plates Are Not Included; Reuse Your Stock Clutch Or Components Must Be Purchased Separately
• Not For Use With Offset Primaries.
• Made In The U.S.A.