Ikuzawa TH1R 1988 race bike goes to auction in the United States

The Ikuzawa TH1R, a one‑off 1988 race motorcycle designed by Japanese rider‑builder Tetsu Ikuzawa, is being offered for sale in the United States. The bike combines a lightweight Harris‑built chassis with a Honda RS600D flat‑track‑derived engine that produces about 61 hp at 7,000 rpm. It never entered series production, making it an extremely rare collector’s item.

The auction is being run by Iconic Motorbike Auctions. The lot includes original documentation that verifies the bike’s provenance. At the time of reporting the auction remained open and the reserve price had not been met, underscoring the niche market for historic racing machines.

Collectors and enthusiasts of Japanese motorsport history are watching the sale, as the TH1R represents a unique synthesis of Ikuzawa’s experience across car and motorcycle racing, and a tangible piece of that era’s bespoke engineering.