I picked up my ms251 used, just like all my saws. This 251 is low hour, maybe just a few tanks run thru. I noticed a rattle which I haven't heard on my other Stihls. I placed a thin nylon washer just behind the metal washer and so far the noise has not returned. View attachment 1027084View attachment 1027085
Thanks for the idea. I think I'll try this on an 024. Even the seasoned shop tek couldn't explain the rattle/grinding noise being produced with 3/8" chain and new rim sprocket kit.