1546-37 Timer Shaft, SV37-54

This timer shaft is a stock replacement part for Harley-Davidson ignition systems featuring manual advance. It covers a wide range of vintage iron, fitting 1930–1964 sidevalve 45CI Solo and Servi-Car models, as well as 45 and 55 CI KH models. It is also compatible with 74 and 80CI Flatheads, 61CI Knuckleheads, and 74CI Panheads. Replacing a worn timer shaft is essential for maintaining precise ignition timing and smooth engine performance on these classic manual-advance bikes. Manufactured by Samwel Supplies, this shaft replaces OEM 1546-37. It is built to original specifications to ensure reliable operation across decades of Harley-Davidson engineering history.