I have a 1992 trx 250 x. (same as 300ex) I have stock sprockets on it, and I triple checked that to make sure. I bought the stock chain link size per the manual and tons of internet research. This bike calls for 86 links. However, when I try to put it on, it's a half link to short, and yes I have the tensioner all the way to the loose position. I bought a half link and now I can not get enough tension on it. Please help, I'm going crazy!!!!!