Suzuki, at least as recently as 2009, has provided a table of standard bolt torques in their motorcycle service manuals that refer to markings on the heads of metric bolts. Two values are listed for each bolt size. The first is for conventional (unmarked) or "4" marked bolts and the second for...
thread404-18490
I've been looking at the centrifugal forces on motorcycle valve stem components at high speeds and found this old thread, which provides a basis for what follows. The specific thrust of this is that I've heard that the centrifugal forces can be high enough to unseat the valve...
