Twin Power 413208 1/4 Inch Conversion Jackshaft Bolt with 10-32 Thread for Big Twin Starters

The Twin Power 413208 is a conversion jackshaft bolt designed to allow late-style 1994–2006 Harley-Davidson Big Twin starters to be used in place of the earlier 1989–1993 starters (excluding the 2006 Dyna). This bolt solves a common threading compatibility issue encountered when upgrading or replacing the starter motor on older Big Twin models.

The bolt features a 1/4-inch shank with a step-down to a 10-32 thread, bridging the gap between the larger thread pattern used on earlier starters and the smaller, coarser thread required by late-model starter motors. This makes it an essential part for any Big Twin owner swapping to a newer-style starter.

Key Features:

• Enables use of 1994–2006 late-style starters on 1989–1993 Big Twin applications
• 1/4-inch shank with step-down 10-32 thread
• Designed to ensure proper jackshaft oil seal engagement
• Sold individually
• Made in USA

Twin Power is a trusted name in quality Harley-Davidson replacement and performance parts. Part number 413208 is also referenced as Twin Power catalog number 99-1026.