For anyone following that's curious, here's what I came up with for comparisons of new ('08 and above) and old ('07 and below) Ninja 250 engines (
Iron Ninjas!! Battle of the 250s! - Page 3 - ninjette.org) -
and comparisons between Euro FI and U.S. carbed engines, via the Service Manuals (
Iron Ninjas!! Battle of the 250s! - Page 2 - ninjette.org) -
Euro:
Alésage x course 62,0 x 41,2 mm
Taux de compression 11,6:1
Distribution DOHC, 8 soupapes
Puissance maxi 33 ch (24 kW) à 11 000 tr/min
Couple maxi 2,24 kgf m (22 Nm) à 8 200 tr/min
Type d'alimentation Injection : 2 x ø 28 mm (Keihin) Double papillo
U.S
Bore And Stroke: 62.0× 41.2 mm (2.5 × 1.6 in.)
Displacement: 249 cm³ (15.2 cu in.)
Compression Ratio: 11.6
Maximum Horsepower: 23.4 kW (31.8 PS) @11 000 r/min (rpm),
Maximum Torque: 22.0 N·m (2.24 kg·m, 16.2 ft·lb) @9 500
Carburetion System: Carburetor, Keihin CVK 30× 2
So based on that info the older engine makes 1.36 more HP than the newer one and the Euro version with F. I. makes .6 more kW (.82 HP) of power than the carbed version. That's assuming many other factors are identical.
Jay