my mate was out on his 300 evo on sunday with us,he previously had a 08 250 rev4.
His first impressions are good the engine response is more aggressive,the lock is greatly improved the bike does feel lighter.
the carburation does appear rich in same way that the 08 was,this was cured on 08 by replacing main jet of 127.5 with a 112.
So he rekons this should improve things but will wait to see what lampkins recommend re jetting.
Big concern is the location of the ignition box low down on side of engine appears vulnerablt to knocks and more worrying,deep water,feel sure this can and will be relocated as people are doing on the 2t evo.
So to sum up,he rekons once run in and leaned of will be the 4 stroke to have (MONTS TO DEAR)