Keith Carlson of Indianapolis and his RD400 has mated a ported and polished 1977 RD400 motor to a 2002 Honda CRF450R frame
The bike started as two projects. A 2002 Honda CRF450R and a 1977 Yamaha RD400. The Honda chassis was used and the stock Showa suspension was shortened; the wheels were switched to 18″ Excel with Buchanan spokes. All the stock Honda Nissan brakes were used also. The engine, control switches, and wiring harness was used from the Yamaha RD400 a 1977 twin cylinder 2-stroke.