Ian_B wrote:
The bike is standard and so I'm thinking thats a whole 45bhp or 22.5bhp each as was pointed out above.

In reality, you are probably looking at nearer to 40 BHP than 45 BHP. Japanese power laws increased the engine restrictions around the same time as the MC28 was released. But it is possible, with enough work, to get some useful power.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30