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You will need the correct tool (or homebuilt tool ) and a torque wrench . The handle bars need to be removed and the top fork clamp removed to get at the adjusting nut . Of course all thats under a small amount of tupperware . I am not at my service book just now but can later add the torqe values and sequence . It has several steps of tighten then loosen and retighten . Perhaps with using the existing bearings you can simply do the procedure in one step as opposed to the ritual for replacing the bearings.
Ok have the book now .
1 tighten the stem nut to 40N-m ( 29 ft lbs)
2 turn stem lock to lock 5 times
3 loosen stem nut to finger tight
4 then retighten to specified torque (specified is 19 N-m /14 ft lbs )
5repeat steps 2,3,4
6 repeat 2 and 4 a third time , ( do not loosen the adjusting nut )
7 ALWAYS use a new lock washer ( for the lock nut )
8Hold the adjustment nut and hand tighten the lock nut to align its grooves with the lock washer tabs.
after installing the bridge ( top clamp ) in place torque the stem top nut to 100 N-m (72 ft lbs )
Aftere all this adjusting Mother Honda says the preload on the bearings should be in the range of 1.8-2.2 Kg ( 4.00 - 4.85 lbs for right and left turns .