I purchased a BR600 that the previous owner had dissablemed and found a broken crankshaft. I got a replacement crankshaft and now I want to put everything back together. I did search here and looked over the Stihl service manual but couldn't find any instructions on properly reinstalling the new crankshaft. The Stihl manual says to not remove it or it will mess up the cam timing. The previous owner did not remove the valve cover plate or cam gear cover plates on the motor if that makes a difference. Any help would be much appreciated. Thanks