Ive tried to search for this quite a bit now and I cant find out any information. I picked up a 2017 yz125 that im building. i know the psf1 came on the 13-14 kx450s. im just trying to get some info on if anyway has done this swap or not? i know a few parts would have to be changed. Just trying to get an idea of what im possibly getting into. any info would be great. main reason im wanting to do the swap is im building this bike to be as light as possible. sounds kinda dumb for a 125 but it think it would be fun.