re jetting and suspension, I use 0-2 clicks of compression and 6 clicks of rebound in the forks, shock has stock settings. The suspension feels harsh at first on all huskies. It will will get more plush continually up to about 800k/500miles.
Jetting: My bike has no mods and I use 32.5 pilot, #3 slide, #60 needle 2nd top clip, 370 main with 96 ron unleaded mixed at about 40:1 with motul synthetic at sea level. Stock jetting here in au is 35 pilot, #3 slide, 60 needle middle clip, 400 main.
These leftover 04's you're getting at a discount? I'm about to trade mine for an 05 which will be my 4th consecutive wr250 :).
And yep on the 14t sprocket, it'll do 100kmh/60mph then tho not much more.