My son KFX80 rear axle nuts came loose.The two that lock together. What is the procedure for tightening them?How tight is the inside one vs the locknut? Thanks Al

 

Tighten down the inner nut until their is no slop or rocking. Then while holding the ineer tighten the outer until it meets the inner one. Check the axle with the rear end off the ground it should rotate freely and not bind.

Rude Dog