So I'm currently attempting to find a rear differential for my 1988 YFM 200, and I can't seem to find one from my year. After trying to parts match, and I've found that the 88 and 89's rear dif are exactly the same, while the 87 looks a bit different. The problem with the 87 is that the pinion shaft isn't marked on the diagram, although it looks to be exactly the same as the pinion shaft on my 88, apart from a few holding parts connecting it to the drive shaft, but those seem like they can just be removed and it would work, but of course im not sure. Does anyone have any tips or experience dealing with these particular machines? Thanks a ton