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Are you referring to the hash marks on the side plates? Never trust them on any motorcycle. To verify alignment measure the distance from the center of the swingarm pivot to the center of the rear axle. Should be the same on both sides.

If you adjust on a rear stand you should adjust fully on the snug side of the spec. On a rear stand the suspension is compressed more than when on the side stand (longer chain path). If you adjust for the loose end of the side stand specs the chain will be a bit too loose.

The old way to get ideal tension is to get the bike on a rear stand and compress the rear suspension with a load binder strap. Compress until the center of the front sprocket, the center of the swingarm pivot and the center of the rear axle are all in line (longest chain path). Now adjust for just a touch of slack, say 1/4" at the tightest spot. Be sure to rotate the rear tire to check for tight spots. That's as close to perfect as you can get it. Also, make sure that the alignment is good as described above.
 

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I never trust them. Depending on the make and model of bike, when the rear axle is loose sometimes you can move those suckers 1/8" without moving the axle. I always measure as described above. It's quick, easy and secure.
 
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