S&S Cycle Circuit Breaker Drive Gear Shaft for 1936-1969 Harley-Davidson Big Twin

S&S Cycle Circuit Breaker Drive Gear Shaft for 1936-1969 Harley-Davidson Big Twin

The circuit breaker drive gear shaft translates engine rotation to the ignition system, and wear in this shaft can cause timing inconsistencies that affect engine performance and reliability. S&S Cycle machines this shaft to tight tolerances for smooth, consistent drive engagement. Replacing a worn shaft restores reliable ignition timing and keeps your Big Twin running at its best.

Key Features

• Precision-machined to tight tolerances for smooth, consistent ignition drive engagement
• Replaces OEM part number 25856-36 for 1936-1969 Harley-Davidson Big Twin applications
• Restores reliable timing drive operation to eliminate ignition inconsistencies
• Extends the service life of surrounding ignition drive components when installed correctly

Technical Specifications

• Application: 1936-1969 Harley-Davidson Big Twin engines
• OEM Cross-Reference: 25856-36
• Function: Circuit breaker drive gear shaft

Fitment Notes

• Fits 1936-1969 Harley-Davidson Big Twin engine applications
• Verify OEM part number 25856-36 against your engine specification before ordering
• Review the Fitment tab for complete year and model compatibility