This brand new 1998 Ducati 916 SPS (#781) is available for purchase from its owner and former Ducati champion Jeff Nash at AMS Ducati Dallas. This bike is brand new with 19 factory miles on the clock.
The ultra-exclusive 916 SPS or Sport Production Special was released to homologate the new 996cc engine for Superbike competition. The previous 916 crankcases had been maxed out at 955cc, and had problems with cracking and stress fractures under racing conditions. New reinforced crankcases were needed, and to accommodate a displacement closer to the 1000cc limit for twins in Superbike the case mouths needed wider openings and wider stud spacing to match. Thus the barrels and heads were new, made wider to match the new cylinder stud spacing. Bore was now up to 98mm, with the same 66mm stroke as before. The heads had larger combustion chambers and bigger valves. Compression ratio was now 11.5:1. Inside you a lighter crankshaft with tungsten plug balancing. The high-pressure double injector fuel setup with P8 ECU was carried over from the SP.
A new set of camshafts was introduced, using principles learned from racing Desmoquattros. They had nearly the same lift as the G inlet cam (and more than the A exhaust cam) but with much shorter duration. The new motor retained the frantic, free revving character of the 916 and SP, but with a stout midrange punch.
To reduce strain on the primary gears a new lower ratio gear set was introduced. Transmission was now a close-ratio box, shared with the smaller 748. First and second were the same as a 916, but third though sixth were lower – so much so that 6 on the close ratio was the equivalent of 5th on the standard box.
The engine upgrades, Eprom, free flow exhaust and various lightweight parts delivered a mighty rear wheel 132 horsepower.
Source : Odd-bike.com + wikipedia.org