u will beat a raptor(not stock) z-400(not stock) and should hang 3-5 lengths behind the 450s i seen a 447ex beat a yfz in a 300ft race both good riders

 

you will kill a z400, my old motor had the same mods and a z400 was no problem. Now with my new motor I raced a stock pred and we stayed even and I passed him a few times, they have about the same power output (low 40's) but yours is probably somewhere around the mid to low 30's depending on what compression ratio and pipe you are using. You should be able to beat a craptor in acceleration but the craptor will pull ahead due to the higher top speed although it probably wont stay ahead for long, as the axle will probably break as well as the transmission blowing or the connecting rod breaking. Now a banshee, those things are pretty fast in stock form, I haven't raced one yet but I think the banshee would win, in a straight line that is.

 

stock : z400,kx400,400ex,raptor,banshee

 

dude how can u not beat(all the way through) a pred and i think if he's got the rite sprockets he will get a raptor on top ive seen it before
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you'll beat my rubicon and deffanetly beat my old arctic cat.[img]i/expressions/face-icon-small-smile.gif[/img]