More power is usually best, but we prefer the delivery of the RS's state of tune better. The greater flywheel mass makes it smoother, and you'll find more torque off the bottom of the range than on the S. This is the classic Oilhead powerband: The torque curve comes up smartly by 3000 rpm and bunts out approximately 55 foot-pounds until it takes a hike at 4700 rpm, reaching a peak of 64.6 foot-pounds at 5500 rpm. From the saddle, this kick is subtle, with the engine feeling fairly seamless and punchy through the midrange, running out of breath and becoming slightly coarse on the far side of 6000 rpm. To belabor the issue of the engine's adaptability, consider our long-term R1150GS. Its even more mildly tuned (but greater displacement) Oilhead gets more than 60 foot-pounds by 3000 rpm and stays there until 7700 rpm, hitting a peak of 69.8 foot-pounds at 5500 rpm.