I think it was pretty easy for Kawasaki to squeeze another 7hp out of a very under tuned & restricted KLX engine.
My guess is a larger throttle body, some head work, lumpier Cams, re-mapped fuel & advanced ignition timing....would easily get the extra power!
This engine would probably loose some low down grunt & be aiming for high end hp.....I'm betting the off-road boys on this forum would not be impressed with the SL's power delivery for the dirt!
But for us SuperMoto riders I think it would be great for the road.
Can't wait to bump into one of these bikes & show them what a 331 with 101Cams can do with 30hp+.....haha