what the hell is an override transmission
You can either do a 1-5 or 2-4 on the R's. The guys above pretty much summed it up, let out the clutch at the start and shift the gears under full throttle with-out the use of the clutch. Be sure to grab the clutch before letting off the gas, because it creates pressure on the shift forks, I have seen them shatter. IE, you can't trail ride this kind of tranny, you can't just let off the gas when you want, or putt around and down shift under load.