I'm replacing the piston on my 650R when I'm in the middle of tightening the head down. BTW - I did a search and I DO have the factory manual. Anyway, the manual says torque the 4 head bolts down to 49lbs using a criss cross pattern. I'm at 35lbs right now and it feels really weird like it's about to strip the threads or just snap off. 49lbs sounds way too high. My 450 has the same size studs and nuts and it only gets torqued to 43lbs. Is the manual wrong? I know there was a mis-print on the torque settings for the frame oil drain. Is there one for the head?