23NM top, 21 bottom. From the Haynes manual, worth getting if you are doing anything beyond the basics.

(Edit: damn, in the time it took me to find the book and have a look, someone beat me to it.)

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XT660R (2006)
XT600E (1994)
Triumph Trident 750 (1992)
My blog: http://goingfastgettingnowhere.blogspot.com/