Congratulations for the site it looks fantastic...
I am a new mc21 ownwer. I have some problems to solve cause the owner before me had no love for this bike.
The bike is derestricted by the tuning section informations.
The oil pump is on but blocked cause didnt have a good feed and i run premix.An other one is in order to fix this problem.
The airbox had no filter inside so i fitted a free flow one and cutted the lid
a little bit at the back where the holes are just to let it take a full breath...
Something to mention here the T piece which is connected with the X piece is left in open air i dont know if normally it is supposed to plug somewhere.
I installed bigger jets 160 mains and i was ready for a ride.
The bike goes fine until 12.000 rpm except the 5-6th gear seems to cut
power nearly 10-11.000 rpm. It seems like it runs out of mixture because
I pulled the choke on and it does the same. Is this normall?
And something else i checked the plugs and they havent got brown they
are somewhat like grey and imagine that usually i ride it around the block.
What should i check to fix this problems and enjoy the bike? Thanks for
reading and sorry for being so tiring but here in greece we have a good
wheather
and my mind is going crazy watcing the bike unready for full throttle abuse 
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The ultimate 250...