Twin Power™ starter shaft gear replaces H-D 31485-65, restoring positive chain-drive engagement for reliable cranking on 1965-1985 4-speed Big Twin Harleys

• Essential for starter rebuilds, eliminating stripped gear failures during hot starts
• High-strength steel gear withstands heavy kickback and high-compression loads
• Direct OEM replacement fits chain-driven starters on Shovelhead transmissions