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The Ducati bevel single heads have two styles of heads. The very common spring valve models, like the widecase 250 shown, have a single rocker arm shaft for each valve (two shafts total) for the single rocker arm used to open the valve. The camshaft end cover on these heads have a wide top narrow bottom design with the engine displacement displayed in the casting. The very rare Desmodromic models, specifically referenced but not shown, have two rocker arm shafts for each valve (4 shafts total) - one for the rocker arm to open intake and one for rocker arm to close the valve. See the plexiglass operational model shown. These heads require a camshaft end cover that’s approximately trapezoidal in shape, with the word DESMO displayed in the casting.The DESMO end cover can be used as on a spring valve head. Poser trick. But a spring valve end cover should not be used in a Desmo head since it will not properly capture the two lower closing rocker arm shafts. You’ll be able to see them. The heads are different castings, with additional material present to support the extra pair of lower rocker arm shafts.And the caption is even wrong, labeling the bike in video as a 350….I like watching videos to learn more, but have reservations about how accurate the rest of the video is when such obviously glaring inaccuracy is presented for the viewer to assume it is correct. Far too many people already think every Ducati is a Desmo. They are not. Beyond the HD bikes shown, I have little in-depth knowledge of the various and somewhat exotic models shown. So I wonder if what’s being presented is accurate or just more convenient stuff (i.e.- they’ll never know the difference..) like showing a Ducati widecase bitsa spring valve bike while talking about Desmo details. Rant over.
Great info Clint. The Desmo bevels get all the love but I like the spring valve heads since they are so easy to adjust. I’ve only had the twins but would really love to get a single sometime.
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