here's some pics of a woodgas powered bmw flat twin motorcycle and sidecar.
not sure what engine size it is, (will be in the range 600-1000cc though) - anyone know which model this is?
the gasifier is the large thing on the side of the sidecar, the vertical copper pipes cool the gas, then there's some filter boxes at the rear of the side car, and i think the thing on the side of the bike itself is a vortex style dust remover, not sure...