Yamaha is quick to point out that the new R1S is not a detuned R1. But there are differences between the bikes. Most obvious visually are the five-spoke aluminum wheels that have replaced the superlight multispoke magnesium units on the standard R1. And with regard to the R1S engine, it’s the familiar 998cc inline-four with the crossplane crank, but the R1’s trick fracture-split titanium connecting rods have been replaced by conventional ones made of steel. The DOHC cylinder head is the same, but new valve springs are now used, likely related to an unspecified lower redline. What’s more, the oil pan and right-side engine cover, magnesium on the standard R1, are now aluminum, and stainless steel exhaust headers have replaced the ones made of titanium. All told, Yamaha says the new 2016 YZF-R1S weighs 448 lb. wet, which is 9 lb. more the claimed weight of the standard R1.