speedbiker wrote: Would be very sad if less than 75hp tho, Can it be done?

You'll need to build a full NSR F3 engine or bolt in a Honda RS250 race engine to get 75 BHP.
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30