S&S Cycle Idler Gear Shaft for 1936-1969 Harley-Davidson Big Twin Engines

S&S Cycle Idler Gear Shaft for 1936-1969 Harley-Davidson Big Twin Engines

The idler gear shaft transmits drive through your Big Twin gear train, and a worn or damaged shaft leads to noisy operation, excessive play, and accelerated gear wear. Machined to precise tolerances, this S&S shaft restores smooth gear engagement and reliable power transmission. Replacing a worn shaft also extends the service life of the surrounding drivetrain components.

Key Features

• Precision-machined to exacting tolerances for smooth, quiet gear engagement
• Replaces OEM part number 25791-36 for 1936-1969 Harley-Davidson Big Twin engines
• Restores correct gear train geometry to eliminate play and reduce drivetrain noise
• Extends the service life of surrounding gear components when installed correctly

Technical Specifications

• Application: 1936-1969 Harley-Davidson Big Twin engines
• OEM Cross-Reference: 25791-36
• Function: Idler gear shaft, primary gear drive

Fitment Notes

• Fits 1936-1969 Harley-Davidson Big Twin engine applications
• Verify OEM part number 25791-36 against your engine specification before ordering
• Review the Fitment tab for complete year and model compatibility