Answers: if you are dealing with a dirt bike, eye balling the results will work fine, remember that the chain is at its tightest point when the suspension is compressed, every bike i've have, has be a little different, i resembling to keep it rather on the loose side, but not so loose that i get secure slap on light accel
You want about a partially an inch of play on the slack side when you put tension on the other.. Also a flawless (not worn out) chain will not verbs away when you grab it between your fingers and try to verbs it away from the back of the sprocket. Be sure the axle is posterior equally, matching the results on the swing arm on both sides.
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