what is everybody runnin on their 400ex. i was thinking about getting a 14 tooth. also whos make the best sprockets? sidewinder any good?

 

I went to a 13 on my 400 and big difference.

 

what was stock? didnt it lose a ton of top speed

 

15 is stock, and with a pipe added I would just go with a 14 depending on weight with a 400EX. Sidewinder makes excellent sprockets, but very expensive. Renthal seems to be alright for me, but I'll get Sidewinders once they wear down. Stock gearing is 14 on the kfx and z400, and my friend did the 13 tooth and really woke it up with the rev box and pipe.