Yamaha VK540EF Service Manual page 266

CYLINDER HEAD AND CYLINDER
9. Install:
S Gasket (cylinder head)
S Cylinder heads
10. Tighten:
S Nuts (cylinder head)
Tightening steps:
S Temporarily tighten the cylinder head nuts
1st step:
S Tighten the nuts 1 X 6
2nd step:
S Retighten the nuts 1 X 6
5-13
1 X 6 as follows.
Nut (cylinder head) 1 X 6 :
13 Nm (1.3 mSkg, 9.4 ftSlb)
Nut (cylinder head) 1 X 6 :
25 Nm (2.5 mSkg, 18.1 ftSlb)
ENG