Twin Cam cam chain tensioner shoe wear
The Twin Cam 88B in 2000-2006 Softails has the same spring-loaded cam chain tensioner weakness as the rest of the Twin Cam line: the shoes wear through, contaminate the oil, and can take out the inner cam bearings and engine. Ask when the tensioners were last inspected (15,000-25,000-mile intervals). The permanent fix is the hydraulic conversion or a gear-drive kit — ask for receipts.
Ask for repair records covering this item. If it hasn't been addressed and the car is in or near the mileage window, price the $500–$1,500 repair into your offer — or make it the seller's problem.