Technical specifications remain scarce, beyond BMW's stated 190 bhp/190 kg. (418 lbs.) power/weight target. BMW sources have let slip that the inline-four employs some manner of "positive valve operation," which many have taken to indicate desmodromics. BMW experimented with desmo valve actuation in the early '90s on its R1 Boxer prototype, and Ducati has proven that this is a reliable way to eliminate the power-sapping effect of valve springs, prevent valve float and allow higher revs. This is a credible suggestion, since the S1000RR is rumored to rev upwards of 16,000 rpm-a rumor supported by the shrieking exhaust note of the World Superbikes tested by Reuben Xaus and Troy Corser at Valencia, Spain.