MCS Petcocks

33 products — part of all Petcocks

MCS petcocks cover the widest span of Harley-Davidson fuel system applications in this category, making them the practical go-to for restorers and custom builders working across multiple eras of carbureted V-twin. Available through Iron City Motorcycles, an authorised Harley-Davidson dealer in Leeds, the MCS petcock range runs from FL models built between 1935 and 1965 with original OEM-style tanks, through 1966–1974 Big Twin and 1957–1974 Sportster applications with internal 3/8-inch NPT threads, right up to the 1975–2006 Big Twin and carbureted XL Sportster generation with external threaded tank fittings. That unbroken coverage from pre-unit Flathead era machines through to the last carbureted Harley-Davidson Twin Cam models gives MCS an advantage over more specialist brands when a single supplier relationship matters. The petcock may be a small component, but a poorly sealing unit creates real problems — MCS units are manufactured to consistent tolerances and tested for the flow rates carbureted Harley-Davidson engines require. For fuel system work on vintage, classic, and early modern Harley-Davidson motorcycles, MCS keeps your options open. Browse the full MCS Petcocks range below.