In the 1978 February edition of Cycle Canada the legendary Honda Engineer Scouichirou Irimajiri, the project leader for both projects said, “The CBX engine is almost identical to the racing unit. The principal difference is that the angle between the valves is more narrow in the CBX since it turns at 10,000rpm where as the 250 turned at 18,000”

When asked how much power could be obtained from the CBX engine, Sensei Scouichirou said, “120 hp is available with the changes to the camshafts, exhaust system and carburetors. Some cylinder head work would bring it up to 130 hp”

Watch this great revue from January 2024 by Ryan from F9 and as usual Like it if you do and Subscribe if you care.

The next two images are from an insert that came in the February 1978 edition of Cycle Canada, My copy is a bit tattered but still a great read.