Need torque specs for the head bolts
SOURCE: 93 artic cat jag head torque pattern and specs
the best place to find it is the service manual. if not avail. i usually 1, tighten it to ~10-20Nm in a 'outwards spiral' fashion, ie start tightening from centre bolts outwards. 2, spiral tighten by 1/4 turn, 3, another 1/4 turn, and 4, final 1/4 turn.
SOURCE: need torque specs for 98 yz 250,rebuilding engine
Go to the site below and you can download a free srevice manual for your bike.
http://www.carlsalter.com/motorcycle-manuals.asp
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SOURCE: torque specs.
Check manuals here:
http://en.wikipedia.org/wiki/Yamaha_XZ_550#Service_Manuals
SOURCE: i need the torque spec.
just make sure it good and tight. torque specs are more for surfaces that have gaskets or something you dont want over tightened. I use a 3/8 impact and just run it down tight.
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