While I haven't seen the engine firsthand, I did speak to a gent who owned an a10 that could do this, maybe not 130hp but over 100hp and at the same revs. He was saying he used a round port head! Wasn't the sort of type to tell porkie-pies.
Anyway I thought I would dig this thread up because it's pretty interesting stuff, the type of power motorbikes are into. Does anyone know how many main bearings your 1000cc motorbikes have?