BIGLKNM Primary Gasket Kit for Harley Twin Cam 1999–2006 — Complete Primary & Derby Seal Set, Oil-Resistant Silicone

BIGLKNM Primary Gasket Kit for Harley Dyna Twin Cam (1999–2006) is a complete clutch primary cover seal set designed to replace worn gaskets and restore a dry, reliable primary housing.

If your Harley-Davidson Touring or Dyna with a Twin Cam engine is leaking from the primary cover or showing signs of degraded seals, this kit supplies the commonly needed gaskets, O-ring, and seals to return the cover to factory-style sealing. The kit matches multiple OEM part numbers and provides direct-replacement components intended for 1999–2006 Twin Cam models, so you can avoid sourcing each seal individually.

What parts are included and why do they matter?

This kit contains the main sealing elements that typically fail around the clutch primary cover: primary gaskets, derby/inspection cover gaskets, O-ring, oil seal and mainshaft seal, plus locating screw gaskets. Replacing all related seals at once reduces the chance of repeat disassembly and leaks.

• 1x primary cover gasket for outer housing sealing
• 1x derby/inspection cover gasket to prevent small oil leaks
• 1x O-ring and 1x oil seal to protect shafts and oil passages
• 1x mainshaft seal and 2x locating screw gaskets for accurate seating

How does this fit my 1999–2006 Harley Twin Cam bike?

The gasket kit is listed to fit Touring and Twin Cam Dyna models from 1999 through 2006 and cross-references common OEM numbers to help confirm compatibility. Always verify your bike’s model year and primary cover style before installation to ensure a correct match.

• Compatible with Twin Cam-equipped Touring and Dyna models (1999–2006)
• Cross-references OEM numbers like 25416-99C, 34901-94 series and 12052A
• Direct-replacement design reduces modification or trimming

What materials and quality can I expect from the kit?

BIGLKNM supplies this kit with ribbed silicone and durable seal materials selected for oil resistance and longer life than brittle stock gaskets. The seals and gaskets are manufactured to resist heat and engine oils commonly used in Harley applications.

• Ribbed silicone primary cover gasket for improved compression and sealing
• Durable oil-resistant rubber and O-ring material for shaft sealing
• Manufactured to match OEM fit and function for straightforward installation

How should I install and maintain these parts for best results?

Installation follows standard primary cover service procedures: drain primary oil, remove the cover, replace old gaskets and seals with the new kit parts, and torque fasteners to manufacturer specs. Use the kit when doing clutch or primary service to prevent rework and check seal surfaces for damage before assembly.

• Replace seals during primary or clutch maintenance to avoid rework
• Clean mating surfaces and inspect for damage before installing new gaskets
• Use correct torque values and new screw gaskets where supplied

Who is this for? This BIGLKNM Primary Gasket Kit is aimed at Harley owners, DIY mechanics, and professional shops working on 1999–2006 Twin Cam Dyna and Touring models who want a full set of primary cover seals in one purchase. It’s ideal for anyone planning clutch or primary maintenance and looking to stop leaks, replace degraded seals, and restore proper primary housing sealing without hunting down individual parts.