We have quite a few bike engined cars over here, mainly Lotus 7 replicas. There have also been a few hillclimbers (different sort of hillclimbs!) built using bike top ends. IIRC I saw one recently with a V8 using 2 Hayabusa top ends.
You could run 2 in series (or parallel) the trick is to get them both running at the same speed. Maybe run one with a flyby wire throttle off the first.
Edit:
Check this out, LOTS of $$$ though. 95kg is around 210lbs.
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The RPA is based on two Suzuki GSX-R1300 Hayabusa engines although only really uses cylinder heads and barrels with most other major ancillaries coming from Powertec. The unit has a flat plane crank and is the narrowest angle ‘Vee’ of the lot meaning it will be ideal for small, light sportscars - like most kitcars in fact. Although heavier at 95kg than the RST-V8 or Cyclone Y40R it has thus far produced the most power. The 2.6 unit has developed 380bhp in dyno testing; with much more to come according to Radical’s Mick Hyde, plus it develops 207lb/ft at just 6000rpm, before topping out at 10,500rpm, just like the RST. Colleague Steve Bennett has seen the unit being benchtested at Radical’s Peterborough base and says it’s a fantastic unit, that looks good, is compact and has massive power delivered in a flat curve of bhp and grunt. The RPA will be mated to a six-speed transaxle designed especially for the engine by Quaife, which will also be suitable for front-engined installations. The company also have plans for a 3-litre version based on their well-known 1500cc bored Hayabusa units. The cost of the engines will start at around £18,800.
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