As with all bikes, but especially with Ducatis a service history is essential for peace of mind. If you can afford to fork out for a 10 or 20k service from a proper Ducati dealer or (like me) build it into the purchase price, then do that. At least get the belts and oil changed and the valve clearances checked. Be prepared for a big bill

if there's much to replace. As a ball park I paid half price for a 20k service NZ$750 on my S4 (4 valve). A lot of Ducs are sold close to a service interval.
There's a saying; "Ducatis make mechanics of riders" which is great if you enjoy wrenching, but can be expensive if you do not. I happen to like it
4 valves are more expensive to maintain than 2 valves. Dry clutches wear out quicker than wet. I replaced my OEM dry clutch after 35000kms NZ$800.
If the bike you choose is ex Japan, then make sure that the dealer resets the suspension to stock settings, before you ride it. Those Japs are real lightweights and they tend to wind out the preload and wind up the damping. You may be looking at re-springing also, unless you are 72kg. I've just spent NZ$200 for a rear re-spring, fronts are next.
Also be careful of noisy aftermarket pipes, they may sound great but may cost you with the new noise legislation. Dealers usually have warehouses full of stock exhausts if you need to swap them out for a compliance check.
Injected Ducs are sensitive to intake and exhaust mods. If the bike has been modified, check that that it has ECU mods to suit. Slip ons are generally ok, but airbox mods usually require a new ECU or a tweak.
Try to get a model with adjustable suspension front and rear. Marzocchi forks are crap and non-adjustable. Showa forks are better. Sachs shocks are ok, Ohlins are better. You may get lucky and get a bike that has Ohlins front and rear.
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