The hot-rod treatment carries through to a nasty-looking engine. In this case, there is more to the engine than just the appearance of power. The motor was torn apart, and Berg mixed and matched components with the older-style 1500 A-model, which supplied the crankshaft, flywheels, and balancer, which are lighter to improve acceleration, and narrower, permitting the use of the A-model side cases, which tuck in a bit tighter and make the engine look unusual even to the knowledgeable viewer. The heads were sent to Mission Yamaha for porting, then fitted with some experimental cams and R&D valve springs. Compression was increased slightly by machining the head, and a Mikuni HSR 42mm carb was fitted (and will probably be offered by Cobra).