The chain needs a certain amount of tension , more than that will cause wear to the guides and stretch the chain much faster possibly break it . With the auto tensioner these have there isn't a way to manually tension without the high possibility of putting too much tension on it. They have notches that prevent the shaft from going loose , pushing on the shaft to adjust it will likely click it into the next tighter notch . If the tensioner doesn't work buy a new one , it is somewhat common for those notches to wear out so the chain can slap it loose . Only a few bike models benefit from manual tensioners , the XT's not one of them.
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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