The 10 cc O.S. Type 10 spark ignition engine dates back to early post-WW2 Japan at a time when the country was struggling to rebuild from the ashes of that unhappy conflict. It was the first new model engine released by the famous O.S. company during its post-war rebuilding period beginning in 1946. It was a fine engine which reflected great credit upon its designer and manufacturer Shigeo Ogawa. A detailed article about the O.S. Type 10 may be found elsewhere on this website.