How do you tighten the chain on 1994 Suzuki katana 600?

Loosen the bolt on the rear axle. Tighten the 10mm bolts, EVENLY. Measure the distance between the frame and the rim, make sure it's equal.

Give your chain about 1-1.5 inch play in the bottom middle, (between wheel sprocket and output sprocket-on the gear box).

Do this is small increments, 1/2 turn at a time, then measure.

Re-tighten the main bolt, make sure it's quite tight, otherwise you'll lose your wheel.

Best thing is to use 1/2 inch ratchet with a 24 inch handle extension (pipe or something that can fit over the ratchets handle)