I will give it a go , and describe how I would go about it . 1) Looks like you will need a spanner for disc side and socket or spanner to suit the axle nut . Also 2 spanners to fit those 2 rear nuts on the adjuster thread . 2) Before you start check if chain has a distinct tight spot , and if too tight , your chain is probably stuffed , but if it isn't much tighter than the rest , you should be okay . 3) I cannot see any axle guide slots on the swingarm , so before you do anything and presuming your axle is in alignment , try to mark the center of the axle on both ends of the actual axle and swingarm , using a piece of masking tape and magic marker . Attach this to top of swingarm running length wise , close as , to axle head and using that magic marker , mark axle center position . 4) We continue , trust your chain is okay , and leave wheel positioned , so tight chain section is underside of chain run , middle of chain length between wheel and frame . 5) Remove jesus clip , and undo axle nut with tools , enough so you can move the nut by hand and a nice small gap between nut and swingarm , leave nut on axle . 6) With the 2 smaller spanners , loosen both nuts on both sides of swingarm out toward end of thread , exposing roughly 1 cm or 3/8" thread and keeping both side fairly even . . 7) Then without turning/ disturbing the wheel , push the wheel forward so the 2 nuts but up against the adjuster plate . (NOTE ; The sprocket / chain is the side of swingarm that dictates the deciding tension , so dictates the movement needed , the other side just has to match it ideally exactly at the same position and therefore tension ) . 8) Check chain tension , you want play from where chain sits in relaxed middle to have at least an inch and 1/2 or even a bit more in either up or down movement for the long length chain . I think this will be alright for tension , but I got to say this is my first extended adjustment , and if I'm wrong please someone chime in . Okay , now you have got to take into account , your weight on the bike in the final tension , so if you are happy with the initial adjustment , 9) carefully with spanner hold the adjuster nut flush to swingarm end plate still , and lock the other but just bite up against it . Now first hand tighten then carefully tool tighten axle nut so tight enough not to move and back wheel on the ground , 10) sit on bike and check tension . If you feel happy with the tension or it has dramatically tightened up then back on stand and repeat 6, 7, 8 . Repeat with sit on bike check till you are happy with the tight spot tension with rider . 11) Okay , so now I would mark the tape where the axle line mark is , an measure the distance either side to see if you have them even , if not adjust the disc side back or forward a touch to match other sprocket side . 12) Now lock up nuts on back adjusters as described earlier ( not hard ) yet and tighten the axle nut by hand then carefully by your tools . Now fully tighten the adjuster nuts . Rear axle nut torque is 72.5 ft lb or 100 nm . Lube chain .
