Jims Valve Springs

6 products — part of all Valve Springs

Jims valve springs for Harley-Davidson are engineered for the professional engine builder working exclusively in the HD V-twin space — the same application focus that has made Jims' engine tools and crankpin components the benchmark for workshop precision applied to valvetrain spring rates and installation dimensions. Jims spring specifications are developed for the actual cylinder head geometry and valve guide dimensions found on each Harley-Davidson engine generation, not generalised from a multi-brand catalogue. The range covers Shovelhead, Evolution Big Twin, Twin Cam, and XL Sportster applications with both OEM-replacement and performance-upgrade rates. For the professional Harley-Davidson engine builder who uses Jims tools throughout a rebuild, Iron City Motorcycles stocks Jims valve springs to complete the specialist supply from a brand that works in no other context. Browse the full Jims Valve Springs range below.