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The differences between the DB2 and the DB4 are subtle, but nonetheless quite 'real' -- at least in stock form. Pretty much like the YB8 YB11 differences you discussed. My DB2 is a light, sweet handling bike, as is the DB4. The more modern suspension of the 4 is a bit more compliant and a bit more precise, but this shows up at the 'edge' when the bikes are both pushed to their respective limits. The frame, again like the 8/11 comparo, a bit more up to date and updated, the oval tubing and manner in which the suspension/engine positioned giving a bit more 'on edge' responsiveness and control. Again, all of this to a degree rather than an absolute.
I have a problem doing and apples/apples on any of my DBs from an engine standpoint since none other than the DB5 is bone stock there. The DB1 has an engine reworked to Montjuich level and then punched out from 750 to about 818. The hotter carbs, cams, race exhaust, etc gives it more punch when added to the lighter weight might allow it to run fairly close to the stock DB2. Of course I can't tell because my DB2 has the 944 kit, flat sides, etc and is also quite a bit hotter than normal. The DB4 has what the former distributor sold as the "Corse kit" -- stock 904 discp but Ti can, flat sides, hotter this and that. So pure performance on all of my early DBs as modified goes pretty much in numberical order of progression.
The DB5 is a stock Ducati 1000DS. The new iteration of Bimota leaves the engines they get from Ducati stock. However, the box stock 1000DS is a superb engine, and in this very up to date 364 pound package is probably the best combination of compliance/performance of all the DBs. I am not sure I want to fiddle with this engine at all, I am having too much fun. Dave
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