The fuel-injected, 1170cc flat-twin is essentially identical to that of the company's world endurance racer, with the same 101 x 73mm cylinders and DOHC, four-valve heads that do away with the boxer's venerable pushrods. The cams are chain driven and operate 39mm intake valves (3mm larger than before) and 33mm exhaust valves (2mm larger), which are arranged radially at an angle of 11 degrees. The improved breathing, optimized combustion and enhanced mixture swirl that the radial valves deliver mean that the standard R1200S Twin Spark ignition is no longer needed. Forged Mahle high-compression (12.5:1) pistons paired with uprated steel connecting rods round out the upgrades to the reciprocating parts. On the fueling front, a Bosch BMS-K ECU controls a single injector in each 52mm Dell'Orto throttle body, actuated by the same variably progressive butterfly linkage as on the R1200S. Twin, stacked oil coolers mounted in the nose of the bike control temperatures and a deeper, finned sump minimizes sloshing under heavy braking or acceleration. Twin, gear-driven counterbalancers smooth out the secondary imbalance of the 180-degree crankshaft and the complete engine weighs just 101 lbs.-much lighter than any water-cooled v-twin. A Euro 3-compliant, stainless steel, underseat exhaust (with single catalyst) is now routed beneath the sump to provide additional cornering clearance. An ECU-controlled, cable-actuated power valve broadens the torque curve, and twin oxygen sensors (one in each head pipe) help regulate the mix. This street-legal engine delivers 133 bhp at 8750 rpm-just 7 bhp down on the racer (due to the more-restrictive exhaust) and a useful 11 bhp up from the 122-bhp R1200S.