Belt Drive & Primary

Open primaries from Belt Drives LTD, the standard for chopper and bobber builds. The 2-inch drive fits 1990-2017 Big Twins, the 3-inch and 3-3/8-inch Monster Top Fuel drives fit 1990-2006 models and shrug off big-inch engines. BDL polished billet inner primary spacers set the offset for wide-tire frames, and the S&S heavy-duty clutch diaphragm spring firms up the clutch behind a stroker. Confirm your transmission and engine year before choosing a width.