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the book will tell you tighten easy and back off a quarter turn. i just take the slack of the chain and make sure its on the adjuster side (turn the sec so all slack is on this side) then tighten chain easy a few times with wrench and back off. i do the final adjustment by hand tighten til it comes up to chain then lock it. the chain will stretch so check it after first 50 and 100 miles