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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Every two years at least, as the belts degrade over time - they go stiff and cause tight spots which means they can jump cogs or even crack and break.
Ducati recommends every 12K miles if you do that in more than two years as well, but 12K = Full Service and the belts get changed in this anyway.