Do you no if I can put renthals on my 250EX? And what happends with the E-start, the key place and on the 250eX the choke?

 

yes you can put renthals on any bike.

 

dude handlebars are handlebars
they will fit but you may have to take the crossbar off or do some modifications to the key switch or whatever

 

my buddy has a 300ex (the same style handle bar plastic thing with the key and choke)...Anyway, he put renthals on and he just drilled a hole in the side of the plastic, about 2 inches below where the stearing column goes through the plastic and put the whole ignition assembly there, the only thing is make sure that it is sealed pretty good, he experienced some problems when he hit water at high speeds till he waterproofed it.