Man I owe someone a BEER! I thought the engine in my beloved tractor was going bad at only 80 hours. I cranked her up and started hearing a squealing noise at 2k RPM. The noise sounded like it was coming from the timing wheel. Then black smoke at high rpms. I thought a bearing went bad and was making plans to test out that 5 year warranty. Saw this post, check out my air filter and it was completely clogged. Cleaned the filer up and she runs good as new! Thank you guys!