KDX's are two-stroke moto-x style bikes, I think they are primarly off-road orientated but still road legal as they are used for enduro's. They may also come in 200 & 220cc variants. I've heard that there is one model that is either significantly better or worse than the others, possibly KDX220SR?
KLR250 - not sure, maybe just a shrunken 650? I ssume that it's still an l/cooled engine?
KLX250 looks like a small KLX650, still with a DOHC engine. There is also a 350 version which is supposedly a superior bike.
To be honest, your best option is to buy TBM. There's a lot of bikes for sale in the back & plenty of dealers advertising just about every bike you can think of. Any one of them should be able to explain the differences.
Steve
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