The Mille engine was not just an overbore of the 860, but a complete redesign of the engine. It had a one piece forged nitrided crankshaft, with plain big-end bearings and a larger oil pump with the oil pressure at 80 psi. The new crankshaft had an 80 mm stroke, and with the 88 mm bore, gave a 973 cc engine, and a 5% improvement in power. The complete MHR Mille weighed 198 kg dry. The gearbox and final ratios were altered to give a better spread of ratios, so that the performance gain is a little better than the horsepower and weight figures would suggest. A kick-starter was no longer available. A Nippon Denso starter motor was standard. The giugiario engine covers had finally disappeared.