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I have always thought that with desmo valve operation that the belts should have a relatively easy life compared to say a 16v car engine where 8 valve springs have to be compressed every revolution. The only possible downside in a Ducati application is the small radius of the camshaft jack shaft pulley and the comparatively tight radius of the tensioner pulleys, the tensioner pulleys on car engines tend to be about twice the diameter. The Ducati of course would probably also be revving slightly higher than a car engine as a general rule.
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