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Message: [QUOTE="csdwarf, post: 1422551, member: 119663"] I have an old 88 ( air cooled kdx) and my dad has a ktm 125 sx, so i might be able to give you a good idea. The 125 - the 125 is good, my dad has it geared down and a flywheel weight and it does really well, he rides with me and my friends sometimes, we ride tight single track trails, but aggresivly, I have a 250 exc and my buddys ride a combo of exc's and MX 250's. The 125 does not have much low end and without the flywheel weight is not very "forgiving" the kdx - I always thought of it as having close to the power of my dads bike, it honestly doesnt, peak hp wise, but in the trails we never can really grab all the top end a motor has to offer, the kdx had a close mid - upper mid compaired to the 125. very strong and fast enough. but the low end of the kdx far surpassed the 125, you will probably not enjoy lugging a 125 around nearly as much as the 200 [/QUOTE]