Motorcycle Springers FAQ
Notes: We have test fit a springer on a 1986-2003 Evo Sportster frame, and the typical aftermarket springer will fit the neck of the frame. There are some clearances to adjust, such as when turning the springer lock-to-lock (fully side-to-side) there is a weld seam on the neck that may have to be addressed, and on some models the fork lock tab is in the way and would need to be cut off.
Another important thing to check is that the bars and risers you would like to run clear the gas tank when turning the bars fully side to side. You may need to run a custom Sportster gas tank and/or change the style of bars or risers you are using to give proper clearance.
The majority of aftermarket springers will have a stem that is 1"" in diameter because they are normally fitted to Harley-Davidson applications. A custom diameter and/or length stem can always be machined to fit the needs of a particular motorcycle frame neck, though one must always then check for proper clearance of the fork-to-frame to ensure it can be turned fully side-to-side without interference issues. You may also need to use a different front wheel, risers and handlebars. In short: do your research!