I have a theory that the lighter you are the harder it is to wheelie the bike. I am very light ~60kg and I have to work to get the front end up on anything but a fully fledged sport-bike. To get the front off the ground on an MC21 with stock gearing at 7,000 rpm I would have to be heaving on the bars. At 9,000 derestricted if you whack it on then it pops up into your palms so long as I sit back in the seat a bit. With the MC28 gearing it's a different story.
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MC28 SE -sold-
MC21 with RS250 engine -for sale-
MC21 race bike -soon for sale-