BIGLKNM Primary Cover Gasket Kit for Harley Davidson Twin Cam 1999-2006 – Dyna FXD FXST FLSTF

Overview

Refresh your Harley’s primary seal system with the BIGLKNM Primary Cover Gasket Kit, crafted for Touring models powered by the Twin Cam engine from 1999 through 2006. This kit bundles essential gaskets and seals to support a reliable primary cover area, making maintenance approachable for DIY riders and efficient for shop work on the road. By aligning with the original layout, it aims to simplify installation while delivering the peace of mind that comes with a complete gasket set.

What’s included

• O‑ring
• Oil seal
• Mainshaft seal
• 2 locating screw gaskets
• Derby cover gasket
• Primary cover gasket
• Inspection cover gasket

Durable design and OEM compatibility

Constructed from ribbed silicone-style material to endure heat and vibration, this kit is designed as a direct replacement for the original primary cover gaskets. It references several OEM numbers to help with compatibility checks, including 12052A, 12066, 25416-99c, 34901-94, 34901-94A, 34901-94B, 34901-94C, 34906-85FM, 34906-85A, 34906-85B, and 11147. The goal is to offer a precise fit that supports a clean, even seal across the primary cover area.

• High-durability silicone components resist compression over time
• Direct OEM-style replacement for straightforward installation
• Complete set minimizes the need for additional parts

Real-world use and benefits

Ideal for routine maintenance, seasonal service, and longer rides, this gasket kit helps maintain a clean seal around the primary case. Outcomes can vary with riding conditions, but many riders report fewer leaks and consistent performance after a proper install.

• Supports reliable primaries during hot days and cool starts
• Helps prevent seepage around the derby and inspection covers
• Comprehensive kit simplifies ordering and installation

Why choose BIGLKNM

BIGLKNM focuses on practical, motorcycle-ready components that pair clear fitment with durable materials. Choosing this kit provides a complete, ready-to-install solution backed by responsive customer support.

• Complete kit with all required gaskets and seals
• Quality materials designed for longevity
• Clear compatibility with popular Harley Touring Twin Cam models

Please verify that your model matches the description before purchasing. We’re committed to helping with accurate fitment and friendly support for every order.

Care tips

After installation, inspect gasket surfaces, torque fasteners per service manual, and run the engine to verify seals. Regular checks help maintain a clean primary area during long trips or daily commuting.