Jims Hydraulic Tappet for 1953-1984 Harley-Davidson Big Twin 2459-1

Hydraulic tappet wear is one of the most common failure points in Big Twin engines, leading to increased valve train noise, poor cam timing, and accelerated component degradation. The JIMS 2459-1 replaces sloppy OEM tappets with precision-engineered billet bearing steel units that maintain exact clearances and optimize roller life—essential if you're running higher lift cams or want reliable performance across extended riding seasons. This is a straightforward bolt-on upgrade that pays dividends in valve train stability and longevity.

• Billet bearing steel construction
• Fits cast iron blocks
• Fits aluminum blocks
• Clearance: .0007"–.0012"
• True center-line design
• Segmented parabolic cup
• Hand-fitted hydraulic unit
• Air gauged to .0002"
• Maximizes roller life
• Improves cam timing accuracy
• 1953–1984 Big Twin compatible