I measured chain slack as close to the rear sprocket as is necessary so the chain doesn't touch the underside of the front slipper. Worked fine for me, but since I've fitted the chain guide, it doesn't really matter any more as, at last, I can run it nice and loose without worrying overly about chain derailment.

I can't tell you how much better I feel knowing the chain is much less likely to exercise random independent thoughts.

stoic bloke came up with the idea. It takes a little bit of rooting around, but the effort is really worthwhile.

Can you, please, detail the mod?

now fixed!:happy8: http://www.xt660.com/showthread.php?t=17951

Good work stoic bloke, that is an accessory every Tenere owner should have! A great service to Tenerekind.