I havejust been wondering how fast I have been going on my 400ex. Its not much at all just stock with a HMF Slip On and K&N Filter but I have been going to my buddy's house and he has a DS 650 and a track and drag strip. We run on the strip alot and he always beats me.... of course, but I was just wondering how fast you think I am running? I was just curious.

 

Maybe around 60-67mph.

 

I would say mid to upper 60's. My rubicon will run bout 58 and it has big 26" mud tires on it, so you should atleast be goin prolly 63-68ish.