First off, please excuse me if my postings are not to your satisfaction, and or correct timeline.
As with any engine (but I will stick to the XG750 you have in question) that is seeking to increase horsepower
it will have larger intake valves, different port designs for both intake & exhaust, higher compression (approx. 14 - 14.5:1),
cams with higher lift-longer duration-and different timing, larger throttle body (possibly 53mm), rebalanced crank (with counterbalance removed),
chromoly H-beam connecting rods, Dynojet tuner w/5 different tuning downloads, ceramic wheel bearings, and micro shot peening of 90% of engine internals. Exact specifics regarding any of these descriptions will not be posted here, as we are working with a few companies to acquire some prototype designs. The engine will remain 750cc, so no boring, no nitrous, no magic.