I have ridden KDX's and I have ridden this. There is a reason the new "Trail" bikes like the CRF250X have MX geometry. It works better for a majority of the riding. The KX handling is legendary btw. It far far from drags it's tail around corners. it carves like a scalpel. At 190 pounds it is super easy to flick.
The biggest difference I notice is the stability though. WOT in 4th standing and hitting 1 foot moguls is no biggie. Might as well be flat. No kidding. The shorter wheel base bikes tend to be squirly at speed when it gets rough. My CRF230 was not safe doing that and it had Cr250 forks and a Works shock. The KDX is longer though so it is not as bad.
Riding position is superior too and visibility out the front is improved. It is wider though and that is a down side for some. Not a little wider, ALOT wider. The suspension upgrade is big step up, yeah. Inverted forks would really make that a good bike. Bar risers and 1/4 forward offset opens up the cockpit and makes it more roomy. Those 2 alone are worth the effort for sure. That is likely more than enough for most anyhow. No question.
The motor is really where the magic is. Let's be honest, the KDX is dated it feels dated the cockpit is cramped. The motor though, man that thing is incredible.
A full swap matches the rest of the bike up to the GREAT motor. But it is more work. I figured if I can not buy what I want then why not make it? Heck, magazines have done it, Fredette used to sell them, they all say the same thing. "Kawasaki should have made them!". In the end that is what made me try it. An MX bike with a trail motor with suspension for my weight and ground clearance too boot weighing in at less than 200 pounds. Wow. Now that I did it I see what they go on and on about. It is that good. It is however not for everybody.
Use a machine shop. It is pretty easy if you do not have to do the welding and drilling.
True, some may opt for a new 4 stroke bike instead. That is a great option as well. Just not the only option is why this is here.
