I hear the 2V air cooled are easier to service vs the 4V water cooled. I have also been told that after a couple valve adjustments (7,500 miles) they seem to stay in spec pretty well. The belts will need to be replaced depending on what comes first miles or time. I spoke with someone who has many Ducs and he doesn't always change the belts based on time, but if it was the only bike to ride then things might be different.
Now if you want some real fun get a Bimota Tesi (Duc powered). To work on the valves/belts you must remove the engine from the bike.
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