my mc21 revs strongly to approx. 11,500 rpm and is unable to increase rpm from there. power drops off as well. possible causes? i'm new to this bike.

Erm, that could well be about it, mine makes peak power at about 11200, on stock pipes it'd drop off sooner.
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fontyy...so, even with a significant drop in power at 11,500 rpm, it's normal to still not reach redline from there?

Mine makes peak power at 10500 on stock pipes and slip ons, but it will go to redline

Does it just not rev, or does it breakdown like an ignition or fuel problem ?
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Check your TPS is plugged in, mine came out once and was awful up top, mind you it was pretty avg all over the rev range, cant hurt to check

it doesn't break down at 11,500... it's sorta like it isn't getting enough air and is choked off.

Sounds like poorly adjusted RC Valves to me. That will stop it revving to 12,000rpm.

It won't make power that high, but should certainly rev there, even with stock pipes.

Could also be dirty air filter element or poor (rich) jetting. You can also check the choke mechanism is shutting off correctly.
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thanks for the replies. much appreciated.