I have seen 18 to 28 hp on this bike, 25-30 years ago when I rode a Kaw and Honda 4 stroke enduro 250 the Honda had 18 at the crank and the Kaw had 18-21 but these bikes had 2 valves per cylinder so I would expect more now. I am waiting to purchase this 250s (when my money is right) The owner of the bike shop showed me the title on this bike and it clearly states 28 hp on the title and I would guess thatsat thecrank. 28 is quite good for a 250 enduro and I should be happy with it.

 

You should post this in the KLX250S section, there has been quite a few people that have had thiers dyno'ed... i believe its around 18hp.... but ask the klx section... Its a great bike, but not blessed with gobs of power.