Yamaha claimed 27 hp for the 350 way back in 1987. I think both of these bikes are on their original top ends. I'm guessing 20hp still remains at this time. With my poor studding skills, I break the tires loose all of the time. There's adequate power for a fat, out of shape old dude like me.
Besides, if I showed up somewhere on a fire-breathing, 500cc BigWheel, then people would expect me to behave like this: