Slicks will fit on the standard Magtek rims (if your racing class will allow it), but you will need to carefully set the suspension up to make the most of them as they will technically be over-sized, and this can ruin the handling unless done properly. Maybe look out for some RS250 NX5 HRC Magteks which will be the correct size for slicks? The rear will need to be fitted "back to front", but it doesn't matter.
As for easy* power, well that's difficult to say. If it's not been set up on the dyno then you may well find your HRC carded 28 is only making 58hp, in which case a good tweak of the carbs could liberate 3~5hp! On the other hand, it may be pretty much spot on already, and in that case you are going to find it very difficult to get any more than 62~63hp without getting inside the barrels and cases with a Dremel!
*62~63hp is the easy (if costly) bit on an MC28!
_________________
Andy.
NSR-WORLD.COM
Please keep all responses to Forum posts on the Forum so that others may benefit.
Please DO NOT PM me for technical advice. My time is precious, and you will probably receive a faster response on the Forum anyway.
Check us out on Facebook! Please "like" our page!