Custom Chopper Build
A chopper we are designing in the shop around a Yamaha XS400 engine. Load the 3D model, spin it around and look it over from any angle.
Walk around the bike.
Drag to turn it, scroll or pinch to zoom, and tip it over to see the underside. The model is the design as it stood on November 10, 2026.
The 3D model is a 4 MB download that starts only when you choose View in 3D.
Built around a real engine.
The engine is a scan
The engine in the model is a 3D scan of the actual Yamaha XS400 engine, taken with a phone and cleaned up. Everything else is drawn around it, so parts are checked against the real thing on screen before any steel is cut.
Frame and front end
A 1-inch tube frame and a leaf-spring fork that carries the XS400 drum brake, with forward foot controls and their linkages.
Tins and trim
A fuel tank made from flat plate, a sprung solo seat, welded handlebars, a rear fender, a sissy bar and a two-into-two exhaust.
A design model, not a finished bike.
This is a working model. Dimensions change as we measure parts and test fits, and some pieces are not on it yet. We will update the model here as the build moves along.
Not a build plan. The model shows a design in development. It is not engineering for a road-going motorcycle and it should not be built from.
Talk to Our Team
Our specialists are happy to answer your questions and help scope your project.