+1, Angus! Archy, you'll get a lot of argument about this, but those of us who've messed with the XS650 for a few decades and have assembled a few motors tend to have pretty clear consensus on the matter of torque checks, and Angus has summed that up nicely. When I put one of these motors together I let it sit cold overnight and recheck torque. I've had 'em give up as much as 6 footpounds from settling on dowels, gasket compression, etc. If a lot of pressure was lost, I give the motor another round of sitting and tweaking. My preference (and that's all it is) is to recheck torque after the first full heating-cooling cycle. I take a fresh motor for a 10 mile ride after as little idling as possible, let it cool, and reinspect, then check again after 100 miles or so.