 A fuel consumption test by Motorcycling Monthly at Britain's Motor Industry Research Association in 1976 returned a performance of while a 3½ bike carried rider and pillion passenger.The engine also incorporated one piece forged steel crankshaft, ball main bearings (first series motors), plain big end bearings (second series motors), and the conrods run on a common pin, desaxe, and offsetting the rear cylinder to the front by .Front and rear barrels and heads are interchangeable.