The theory is simply to make sure that fastener moves during the torquing process, in order to get a more accurate result. Does it really matter on a Guzzi cylinder head that is receiving its 1000 mile retorque? Not one iota. The Guzzi cylinder head gaskets are soft enough that something would have to be seriously askew to NOT break the fasteners loose. When I recently checked the torque on my G-5, which had new head gaskets installed by the previous owner, it only took about ten foot-pounds to get things moving. That's pretty loose considering that they started 2000 miles before at nearly 30 ft-lbs.
Guzzi-@aol.com wrote:
Never could figure out why you would loosen heads to tighten them,what is the THEROY behind this.Mark