Whelp, I picked up a cr500 piper and whacked the mouth off of it and started to see how this bad boy was going to fit in the ol kx250 steelie. I dont know how its going to happen without some major pipe bending/denting etc. Im wondering if the PO didnt put this motor in there in a different way and that is why he had a yz250 pipe and kx250 silencer on it. A 500 pipe and silencer dont appear to be useable? Unless someone knows how to make a super custom pipe work???
if you able to read, look a former post of me here in the thread
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its simple to install a cr500 exhaust to the kx500 . or sea it on my website, but watch out, the cuts in the pipe, that i made, are only because i wouldnt make a dent to the inside of the pipe for the water elbow. the stock-honda-pipe has thicker walls, as aftermarket-pipes, so is denting on it a hard work.
you can also try to turn the elbow upside down and using the water-hose like on the service-kawasaki´s . then you need no denting the pipe and only making the right fitting to the cylinder...
you can mashine an adapter that sticks in honda -pipe and kx-cylinder or you weld on the right flange ...