Hi, Ive got an 01 WR426 motard. The bike has with a DID ERT 520 chain, and there are tight spots in the chain when I adjust it, but it has absolutely no tight links throughout the entire chain when I take it off and inspect it. The chain and sprockets have a little less than 2k miles on them. I know that the chain needs replacing when there are tight spots in the links, but I've heard that tight spots are relatively normal when the chain is on the bike, from chain stretch. The teeth look good on the sprockets as well. Does it sound like the chain needs to be replaced? Thanks!