Mousetrap Parts

1 products

Our mousetrap parts for Harley-Davidson — indexed under Clutch & Primary — are the specialty parts for the mechanical clutch booster mechanism (known as the mousetrap) on vintage Harley-Davidson Big Twin bikes. Iron Stable is run by Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, and this small section is supplied by MCS. Typical fitments cover 1941–1967 FL models and 1967–1984 4-speed Big Twin in custom applications, and 1952–1967 Big Twin clutch booster springs. A correctly operating mousetrap is essential to clutch feel on any pre-hydraulic Harley-Davidson. Browse the full range below.