All

I'm not much a forum guy, just here trying to help after decades of experience with YZ250's. Yes putting a small pin in the linkage is part of the process to tighten that small 8mm bolt head for the valve linkage under the side cover. Last time I tried to break the center exhaust valve by not using that holding...

I just had that happen for the second time on my 2012 YZ250. By the time I found it both times the cross pin had pounded itself out causing the center valve to stop operating at which point I pulled the top end apart. Both times only one tab was broken off. The center exhaust valve is aluminum and the...