I've got a Ducati Manual which covers 2000 M900Sie. Quite a weighty tome! and info scattered all over the place.
It gives fixed tensioner @ 19Nm M8 x 1. Mobile tensioner @ 26NM M8 x 1.25
It also says use Loctite 243 (high strength) on both, but I never do on the mobile tensioner. Good idea on the fixed one though.
Glad I didn't post from the hip as I had 22Nm in my head for the quadrant bolts. I never assume when actually torqueing down though.
Incidentally the threads in the heads are helicoiled from new, so it's worth being careful with them. If there is a problem and they need to be replaced, I understand that Wurth inserts can be used, which apparently are over-sized from Helicoils.
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