So,what's with the loosen and retorque of the heads at every valve adj. Seems to me like it would break the head and cyl. seal and promote leaks,over stress threads and promote studs backing out.In other motor work,it's torque then retorque that's it.I can see checking the torque,but why loosen. I just replaced all the head/cyl seals in my 1983 R100,20K.No leaks when I got it,but did the loosen/retorque thing and the cyl base started leaking. I used the proscribed sealent in the proscribed manner to reassemble.By the by there was no sealent on the cyl base and the cyl O ring gasket was white.