There's only one V4 superbike in the market other than the Panigale, and it's arguably Ducati's biggest headache ...

Water/oil Cooled 4-cylinder 4-stroke in-line engine, four titanium valves per cylinder Desmosedici Stradale 90° V4, rearward-rotating crankshaft 4 Desmodromically actuated valves per cylinders ...

Water/oil Cooled 4-cylinder 4-stroke in-line engine, four titanium valves per cylinder Desmosedici Stradale 90° V4, Counter-rotating Crankshaft Desmodromic Timing, 4 Valves Per Cylinder, Liquid ...