Japanese company Moriwaki Engineering have revealed their new machine which they plan to race in the FIM Moto2 class which will replace 250s in 2011.
Moriwaki have produced their own chassis to fit a 600cc engine from a Honda CBR600RR and plan to race in the machine in the All Japan Championship ahead of entry into Moto2.
A Moriwaki statement read: "Moriwaki are very excited about having this new world GP class that allows us to race our original racing machine with all Moriwaki's engineering capabilities.
"There is a tendency in the industry towards transferring from 2-stroke to 4-stroke and it provides an opportunity.
"Taking this opportunity, Moriwaki is very happy and looking forward to competing with all other original machines, with ideas and engineering manufactured by constructors from different parts of the world."
Moriwaki last raced in GPs in 2005 when Tohru Ukawa and Naoki Matsudo raced a 990cc machine at selected races.
Olivier Jacque and Andrew Pitt have also raced for Moriwaki.