I've found posts on here regarding broken hubs and loose sprocket bolts or chain too tight but listen to this one.
I've been riding well over 20 years and have never broke a hub, had 6 different 450's and race +25A, until my 2013 YZ450f.. Broke the first one a month ago and thought a rock caused it, new hub all new chain and sprockets and busted the &%$#@!er again.
I read the posts on how to not tighten your chain to much but there's a fine line between to tight and so loose its actually grinding away the inside of the frame and making so much noise you can't ride normal.
The first hub broke on a landing and the second one over acceleration bumps and ripped the sprocket completely off the bike.
I've always loctite the sprocket bolts. Are these new hubs just cheaper built?