518880 Clear plastic plug, short

Setting your ignition timing is a lot easier when you can actually see what is happening inside the case. This short, clear plastic timing plug is a direct replacement for the original hex head or Allen head plugs found on a wide range of Harleys. It features a 5/8"-18 thread and fits 1938 to 1999 Big Twins, excluding Twin Cams, as well as 1952 to 2003 XL Sportsters and 1938 to 1973 45-inch Flathead models. This specific short design is engineered to avoid contact with the flywheel during dynamic timing. It is a handy tool to have in the drawer, replacing OEM numbers 96295-65 and 518880. For those who prefer a plug that lightly touches the flywheel to clear away oil mist for an even sharper view of the marks, consider the longer specialty timing tools instead.