What do you think top speed on 400ex is with K&N filter, jetted carb, titanium4 muffler.

 

like 180

 

i started a topic on the 400ex top speed(search under 400ex top speed it will say 400 ex top speed from 69 - 185) you should read it its very funny.people have said 180mph some that said that found some cool ways to get it that fast.the true speed is between 62-65 if i remember correctly.the mods you have dont add speed just power so you get to your top faster.you need to change gearing' tire size, or a cdi to add speed.

 

just saw you that you do have a cdi so my best guess would 69-71.if you realy want to know find out.first find someone that has a portable gps put it on the page were it records speed (clear it before you start) then find the longest road you can and open it up.