The 2008 changes are far from just cosmetic, however, with the Ninja sporting multiple revisions to its liquid-cooled 248cc Parallel Twin. Although it retains a 62 x 41.2mm bore and stroke, Kawi reps claim changes to 70% of the engine. Internal modifications include reshaped intake and exhaust ports, a more compact combustion chamber, thinner valve heads in addition to new camshafts and camchain tensioner. Another enhancement is the more efficient cooling system, with a redesigned Denso radiator and noise-reducing fan keeping the 250 running cool.