Also the radiator expansion tank - you run water only so can top up any overflow.
My MC21 was making 65hp after minor work: Tyga pipes, modded airbox and no filter, HRC jet kit, Tyga stuffers, HRC ignition de-restrictor. Pulled very nicely from 7000 to 11,800 when the jetting was spot on. Other times it'd bog down until 8500 which is why I switched to four stokes in the end - got fed up of rejetting between every race!
You can use RS pistons in the NSR for a bit more power, but they wear out faster. How much money have you got?
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball