Originally Posted by antonn
please explain your logic it makes no sense to me to shorten the stroke on an already oversquare engine
The revs need to go much higher to make usable power, not peak power.
Once your oversquare, the bigger the bore the more the power is going to come on higher up in the rev range. So, double down on that and +2mm the bore.
Only problem is it makes even more peak power, but if you want it to be really usable you need to lift the revs. If you shorten the stroke and switch to much higher-quality components, you can lift the revs 1-2K rpm.
Once you have a higher rev ceiling, you can swap the gears and ride it higher in the power band. That will minimize the differential between peak and minimum HP and smooth the power delivery on track.