The rc valve gives you a smoother power delivery by adjusting the shape/timing of the exhaust port.

On my MC16 it pulls well to 7500rpm then goes flat for 1000rpm and pulls again me and a mate managed to smooth it out abit by adjusting the program on the controler.

Shes designed to go round corners realy.
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Honda nc23 CBR400 AERO 1986, 1990 honda NC23 Tri-Arm, 1987VFR400 NC24 Rothmans Rep, NSR250 MC16 1987, CL250s 1983. Moto guzzi zigolo 110cc 1958. Fantic 50cc 1972. Suzuki Cobra Race bike 500cc 2t 1975 , GP125 1975. Triumph T110 1954. BSA Thunderbird 1955. Ariel VB 600 1952, 1990 MuZ 125 etz.