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Message: [QUOTE="placelast, post: 680124, member: 22683"] I recently bought a ’98 KX125-framed ’90 KDX-engine bike from a friend; he bought it from the surgeon. E-mail me at millenniumdsj@hotmail.com for more info unless you think others here would benefit from our exchanges. It’s good to hear your motor runs great. Mine starts & runs OK but is a dog (compared to my RMX – not fair). I haven’t had time nor $$ to go thru it to see how much TLC is needed, but I want to extract more HP for sure, to go along with the chassis. I cannot vouch for ’99-up frames, nor the chassis performance of one over the other. One would think they’d improve year-to-year but that’s not always the case. Most current should be best, but in your situation you may have to use what is available. This one came with an RMX front end. ‘94 thru ’98 use the same plastics & seat; the rest should be the same. (UFO has flo, regular green, plus white and black available. Mine is all flo, w/FX graphics & a sticky grip seat cover – good looking but too grippy - both will be replaced with less tacky Technosel goods soon.) The stock KDX head stay appears to have been chopped off & a block of aluminum welded and fitted at the opposite end for securing to the KX frame bracket. My KDX head still contacts the stock tank & needs some add. grinding to clear. I have a separate IMS tank that fits =, although the extra capacity is not needed so it’s off to E-bay soon. I cannot tell if the KX frame mounts were reused or replaced, nor how the swing arm/bolt/cases interface was modified. I can look at it and let you know if you need to do some custom fitting there. Dynoport used to make pipes for the conversion. I bought the last NiCr-plated pipe; they have one more in raw steel. They sent me several tips so my guess is custom fitting is required. The bike came with an FMF with a custom stinger by the original fabricator to mate with what appears to be a KX125 TC S/A II. A non-concentric spacer-ring was machined to mate the KX air boot to the KDX carb. [/QUOTE]

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