I know the designation convention too, Mick, but I strongly suspect since all that were built were intended purely as a racebike, that the motor would have been "stock". They had Keihin 28's for Pete's Sake! The recipe Bimota has always integrated was a manufacturer's motor, tuned and turned up, plus a frame of their own design, and suspension of the highest quality available, plus their bodywork.
But I'll return to my prior premise: given the nature of this recreation, Wiseco 836 seems the minimum.
I'm not besmirching anyone, just making an observation. I think a hot street motor would be the Bee's Knees for this product.
Yeah, I understand why you are saying Cal, what I was saying is that most HB1's i've seen, all had different engine configurations, I've seen them with Jap auto 970/1000cc engines, 900cc kitted, 970 kitted, CR31 equipped, It was up to the buyer what was done with the engine, after buying the frame and body kit, Bimota didn't supply them with engines, there were 10 "kits" sold , I'm pretty sure that the only ones that were produced at Bimota that had engines in them were Bimota's actual race bikes, the ones that were sold to the racing public were just frame kits, No engine fitted...
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The kit..
1 frame, made of steel tubes (Columbus).
2 swingarm box, steel.
3 Ceriani fork (35mm).
4 Front oil tank.
5 four exhaust pipes.
6 runways.
7 petrol tank.
8 fuel cap (Alu).
9 Saddle-tail holder (GRP).
10 front rim (magnesium).
11 rear rim (magnesium).
12 Dual front disc brake (Fontana).
13 pump front brake system.
14 rear disc brake (Fontana).
15 shock absorbers (couple Ceriani or Marzocchi).