I have a 99 kx125 with a pro circuit down-pipe, v force 3 reed, pro circuit pipe, milled head, a alot of other mods and i absolutely destroy my buds 400ex that has just a pipe...... its not even close... but given my bike is modified but id say u would kill both of those quads with a stock 125

 

I'm assuming your talking about a drag race. If it's in deep sand or something similar the quads will kill you out of the hole. But once you get on top of the sand you should be able to run them down. If it's on packed dirt or pavement slip your clutch a little out of the hole, so you don't wheelie, and you should only see them when you turn around at the finish.

 

ya many factors affect the outcome..... but i didnt think about sand or a loose substrate like that.... so ur right about that

 

125 ALL the way ive raced a cr 125 on my 350 and I have a lil work done to it and it killed got me pretty good. 2 stroke bikes are fasttttt.