I took a in the Tuning section in regards to the MC18. Apparently they fall flat at 10,000 rpm.

Now, instead of of the motor falling flat at 10,000rpm (despite how carefully you have set the RC Valves up!), it will pull right through to the red in every gear! A little careful jetting and maybe a change of final drive ratio should see top speed increased to a l

I'd start by seeing if you can get past 10,000 rpm in 6th. No doubt you've tried this

If it feels more than 45HP and it revs past 10,000 rpm in 6th, then I'd leave it alone. Something has been done that's bypassed the restriction. If you haven't been past 10,000 rpm in 6th, WHAT THE HELL IS WRONG WITH YOU!?
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MC21 Honda NSR250. TYGA 300 conversion.