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Message: [QUOTE="adam728, post: 949284, member: 55463"] A stock KDX is much slower than a stock 125 MX bike. A decently modified KDX (pipe, silencer, no airbox lid, proper jetting, reeds) will be close to as fast as a 125. Throw some more work in there (like porting, head work, possibly big bore) and you will run neck and neck or a touch faster than a 125, but have a much more user friendly motor. I don't think there is much you can do to make it run with a 250 MX bike, unless you are talking a 7 year old, clapped out stock 250 MXer. After saying all that I have to say this, a LOT depends on the rider. I've raced a few motos (250C) on my KDX, and do alright. The suspension hurts more than being down on power. On short start straights I can usually end up in the front half of the pack, even though I am down an easy 10 hp. On longer starts I usually end up further back, like say 30th out of a 40 rider start, for example. With equal riders a KDX will get smoked by the time you are 30 feet out of the gate. That being said, the KDX isn't bad in open spaces. Stock my 220 was a big disappointment to me, it fell on it's face at a very low RPM. It would still keep pulling, it just didn't do it quickly. I ran 71.9 mph on a gravel road with a bike that was stock other than fork springs and dual sport lighting. Now my bike has the following mods: FRP porting FRP milled head and reshaped dome FRP bored carb FMF desert (or Rev) pipe FMF Turbine Core 2 silencer Boyseen Power Reeds Cut up air box lid Proper Jetting 13-49 gearing (13-47 is stock) The bike is an animal compared to a stock 220, and is much more fun for me to ride (I ride aggressivly 95% of the time). It's still no MX bike, and feels like a little girls power wheel compared to a 250 or 450 MXer. Don't get me wrong, it goes pretty good, and with a little body english I can stand it up in all the gears (ok, with a LOT of body english in 6th). But I also have a ton of time and money in it to still get whipped by stockers. I promise you in a side by side drag your Predator would whip my bike. I used to be a Polaris mechanic. :) [/QUOTE]

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