Take four Yamaha 1,000 motors, bolt them together, and what do you get? A Callaway Cyclone V16 producing 550 hp and weighing 152 kg, that’s what.
The Callaway Yamaha motor is an 80-valve special built by Reeves
Callaway, who made a reputation tuning Chevrolet Corvettes for high
performance and also helped Yamaha develop their five-valve cylinder head.
So it was a natural for him to see how many 1,000 cc Yamaha 20-valve top ends he could mate to a pair of crankshafts (answer = four, obviously).
The company’s website claims the motor is a prototype for a "future Callaway project," but we think they’re not telling the whole story. Can you spell "80-valve scoooter"? Of course not. Neither can we, but we’re looking forward to see what it eventually ends up in (hopefully not a skip).
You can hear all 80 valves running at the Callway website.