The first engine was built in summer 2002 and tested in the autumn. Twin butterfly valves for each throttle body were used to increase control and allow the ECU to vary the mixture flow and ignition map according to the gear selected and speed. The specification of twin spark plugs per cylinder and multi-hole fuel injectors by Mark Jenner (fuelling, ignition and emission design engineer) allowed the Rocket III to meet the Euro IV emissions limits at launch. The torque curve is modified for each gear ratio, enabling over 90% of the engine’s torque output at 2,000 rpm, giving the high levels of flexibility that the designers needed. The 1,500 W starter motor on the Rocket III puts out as much power as the engine on the very first Triumph motorcycle, Siegfried Bettmann's 1902 single.