Still short of development cash, the company was restricted to launching developments of existing products, most notably around the popular Norton Commando. With its classical parallel twin probably by now overdeveloped, from March 1973 the Roadster, Hi Rider, and the Interstate all began to use a new 828 cc engine.
Due to financial constraints, the company was restricted to releasing updates of existing products, particularly around their popular Norton Commando motorcycle.  By March 1973, the Roadster, Hi Rider, and Interstate models switched to a new 828cc engine after their classic parallel twin engine likely reached its full development potential.