Have a 2011 YZ450, in process of redoing top end. I tried to get my crank end access cover off. After spraying with penetrating oil and heating up it will not budge. The 14 mm allen is now rounded out on the cover after a few attempts to loosen. My next attempt will be a chisel and punch on the outer edge. Any tips or tricks for getting these out? I was thinking about possibly drilling and tapping a hole with left hand thread but worried about debris in the engine. The cover will be thrown away at this point so I just have to get it out. Anybody had a similar issue and what worked?
Edited by JLB943, November 24, 2015 - 05:28 AM.