Billet Proof Designs Starter Jackshaft Kit 10-Tooth for 1994–2006 Harley Big Twin — Heat‑Treated Complete Replacement

Complete 10-tooth starter jackshaft replacement kit for 1994–2006 Harley Big Twin Evolution and Twin Cam models, including bolt lock plate and all hardware. This Billet Proof Designs jackshaft kit replaces the entire factory starter jackshaft assembly with a ready-to-install set of hardened components. The kit bundles the 10-tooth starter/pinion gear, coupling parts, jackshaft extension, output coupling, return spring, retaining clip, and the 10-32 bolt with its lock plate — the latter often omitted by other aftermarket suppliers. All heavily loaded parts are heat-treated steel intended to withstand starter torque stresses while fitting a wide range of Electra Glide, Road King, Street Glide, Road Glide, Softail, Dyna and FXR models from 1994 through 2006.

How does this kit simplify a jackshaft replacement?

Rather than sourcing separate pieces, this kit arrives as a complete assembly so you can remove the old jackshaft and swap in the new unit without chasing missing parts. The included lock plate and matching bolt mean fewer trips to the hardware store and fewer compatibility questions during installation.

• All necessary parts included for a direct replacement
• Bolt and lock plate supplied to prevent common omission issues
• Heat-treated stressed components for improved durability
• Fits factory mounting and clearances on specified Harley models

Will this fit my 1994–2006 Harley Big Twin or Twin Cam?

The kit is engineered to match the jackshaft geometry and starter engagement used on 1994–2006 Harley Big Twin Evolution and Twin Cam motorcycles. It covers Electra Glide, Tour Glide, Street Glide, Road Glide, Road King, Softail, Dyna and FXR model families within those model years.

• Compatibility: 1994–2006 Big Twin EVO and Twin Cam
• Model coverage: Electra Glide, Tour Glide, Street Glide, Road Glide, Road King, Softail, Dyna, FXR
• Direct-replace dimensions to align with factory starter and cases

What materials and build quality can I expect?

Critical load-bearing parts in the assembly are machined from high-strength steel and then heat-treated for improved wear resistance and toughness. Components such as the 10-tooth pinion, couplings and jackshaft extension are produced to endure repeated starter cycles and torque loads typical of Harley starters.

• Heat-treated high-strength steel for main stressed parts
• Precision-machined mating surfaces to maintain alignment
• Supplied hardware sized to OEM thread and retention requirements

How easy is installation and what else will I need?

Installation is straightforward for anyone comfortable with basic motorcycle mechanical work and starter removal. You’ll typically need common hand tools, a torque wrench for critical fasteners, and standard shop supplies; no additional custom parts should be required because the kit includes the lock plate and bolt.

• Comes with retaining clip, spring and 10-32 bolt with lock plate
• Requires basic tools and standard mechanical knowledge
• No extra sourcing expected for typical Big Twin/Twin Cam swaps

Who is this for? If you own a Harley Big Twin from 1994–2006 and need a dependable replacement for a worn or damaged starter jackshaft, this kit is tailored for you. It suits DIY mechanics, restoration shops, and custom builders who prefer a single purchase that includes hard-to-find hardware (like the bolt lock plate). Choose this kit when you want an OEM-fit replacement built from heat-treated materials to restore starter engagement and eliminate the hassle of piecing together separate parts.

FAQ

Q: Does this kit include the bolt lock plate?

A: Yes. The kit includes the 10-32 bolt with lock plate and retaining clip so no separate hardware is required.

Q: Which Harley models and years does this fit?

A: Fits 1994–2006 Harley Big Twin Evolution and Twin Cam models including Electra Glide, Road King, Street Glide, Softail, Dyna, and FXR.