A few misunderstandings here - It isn't a "big bang" engine - it's a 4 cylinder with a 2 plane instead of the normal single plane crankshaft. The crank layout is a copy of that used by Helmet Fath to beat the works BMW's to the 500cc world sidecar championship in the late 1960's'. It doesn't fire a cylinder every 90 degrees of crank rotation - it would have to be a straight 8 to do that - it still only fires twice for each rotation of the crank. The firing intervals are the same as on a 90 degree V4. It is a slightly heavier engine - the crak journals are up from 28 to 32mm and a balancer shaft is required. Not necessary for the road, but it will sound like a V4 and give a similar feel.