I have a 2013 800 trail that started making a horrendous clicking noise on the right rear. Mt son ran along side down a hill no engine in neutral and he said CV shaft was bad. I agreed and replaced it, That noise went away but we could hear the noise on the left side also but not as bad so we replaced the left rear cv axle. The noise was still there. If I was coasting down the hill no power you could hear it easily. I just covered the brake pedal with my foot and the noise went away. I decided to search here for clicking sound that everyone thought was a cv joint. Guess what I found? Well I did the adjustment today and the right rear took 16 one quarter turns to tighten and the other three took 13. Backed of 3/4 of a turn instead of 1/2. Going riding tomorrow I am sure the problem is solved now. Oh well at least I know my rear axles are good for several years.