Quote:
Originally Posted by Capo
Note that the cam lock tool for the S4R differs due to the dropped cam
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A legacy of the original application of the motor in the ST4, apparently. The ST series began with the ST2 2-valve motor with its weird air/water cooling and compact head dimensions. The demand for more ponies from a four-valver in the same chassis couldn't be satisfied with the DOHC four-valve head until Ducati lowered the exhaust cam by about 10mm to give clearance to the front wheel. Since the S4 and S4R Monsters have the same ST chassis, the motor is specific to them too. It's interesting that Ducati would undertake a re-design of the 916 motor head just to suit what I presume is a different weight-distribution of the ST chassis, though I've never seen it explained in detail. Mind you, there can't have been many owners of the 916 series that carried a pillion passenger and luggage!
Nick (Ducati ST enthusiast)