i have an 02 sportrax 400ex and the other day me and my girflriend were riding on it together. after about 10 minutes it started knocking or clicking from the rear of the swingarm when i turn. has anybody encountered this problem on chain drive 4 wheelers? i think the chain got a little too tight. any help is appreciated.

 

Worn rear sprocket or chain or both. Try spraying the chain with wd40