V-Twin Valve Spring Set for Harley EL/FL Knucklehead Engines (13-9523) — 4 inner and 4 outer springs, 1.638" OD

Replica-type valve spring set for Knucklehead engines, containing four inner and four outer springs designed for authentic restoration or rebuild work on Harley-Davidson EL and FL models.

• Outer diameter approximately 1.638 inches for a precise fit in vintage valve assemblies.
• Outer spring inner diameter (ID) 1-1/4 inches.
• Manufactured in Japan to meet high standards of quality and durability.
• Cross-reference compatibility with OEM numbers 18203-36, 18204-36, and 168-36.
• Fitment includes Harley-Davidson EL models (1936–1940) and FL models (1941–1947).
• Part number: 13-9523. Includes four inner and four outer springs for complete valve train restoration.

Designed to maintain proper valve operation, support engine performance during overhaul, and reduce risks associated with valve spring fatigue or failure. Easy to install with the right tools, and commonly paired with the V-Twin Bench Valve Spring Tool (SKU 16-1774) to ensure precise compression during assembly.

Whether you're restoring a Knucklehead to original specifications or seeking authentic parts to improve reliability, this V-Twin valve spring set delivers a faithful, durable option for vintage Harley-Davidson engines.

Replica type valve spring set has 4 inner and 4 outer springs for Knuckleheads.

Enhance your vintage Harley Davidson engine maintenance with the V-Twin Valve Spring Set, part number 13-9523. Crafted with precision, these springs feature an outer diameter of approximately 1.638 inches, ensuring a reliable fit for classic Harley Davidson models from 1936 to 1945. Manufactured in Japan, the springs are designed to meet high standards of quality and durability, providing optimal performance and longevity for your engine overhaul or restoration projects. The set includes springs with an outer spring I.D. of 1-1/4 inches, making them compatible with a range of OEM cross-referenced parts such as 18203-36, 18204-36, and 168-36. These springs are essential for maintaining proper valve operation, ensuring your engine runs smoothly and efficiently.
The V-Twin Valve Spring Set is ideal for vintage Harley enthusiasts looking to restore their bikes to original specifications or improve their engine's performance. Easy to install with the right tools, these springs are a vital component for maintaining valve timing and preventing engine issues related to spring fatigue or failure. Whether you're a professional mechanic or a dedicated hobbyist, this set offers the reliable performance you need to keep your Harley Davidson running at its best.
As part of your engine rebuild, consider pairing this set with accessory tools like the V-Twin Bench Valve Spring Tool (SKU 16-1774) to simplify installation and ensure precise compression during assembly. Invest in quality parts from V-Twin to preserve the heritage and performance of your vintage Harley Davidson motorcycle.

Features:

• Outer diameter measures approximately 1.638 inches for precise fit

• Manufactured in Japan for high quality and durability

• Includes springs compatible with OEM cross-references 18203-36, 18204-36, and 168-36

• Suitable for Harley Davidson models from 1936 to 1945

• Designed to maintain proper valve operation and engine performance

• Part of a comprehensive rebuild or restoration kit

Fitment:
Harley Davidson EL 1936
Harley Davidson EL 1937
Harley Davidson EL 1938
Harley Davidson EL 1939
Harley Davidson EL 1940
Harley Davidson FL 1941
Harley Davidson FL 1942
Harley Davidson FL 1943
Harley Davidson FL 1944
Harley Davidson FL 1945
Harley Davidson FL 1946
Harley Davidson FL 1947