Lamoco by a belgium ingeneering called Laguesse 2 stroke 350 with 2 contra pistons on each barrel and rotary disc intake, noticed also the fork which was as the later low boy Norton Manx and which was telescopic.
3 were built, seem only one survived
the same guy had built before for Gillet d'herstall, the belgium motorcycle factory, a single 2 stroke 350 with two conta-pistons on the barrel, air cooled and liquid cooled with... compressor which got the belgium speed record on the 350 class on the earlies 20s with nearly 100 MPH :clap
the Lamoco engine was very similar to this so call revolutionary project from the 21 th century
http://www.youtube.com/watch?v=uP7gGUCPJj0&NR=1