I bought a used 2016 Timbersled LT 137 last spring. I'm hearing that the 2016 Timbersled Chains are garbage. The chains on my machine are JT 520 X1R2. Are these the bad chains everyone is talking about? Or did the previous owner upgrade the chains? I have 8 days of riding on it and that's with nitrous. The chains have stretched a little.