It took some time but I finally go my H to start. Thanks for all the advice. I checked the valve clearance and sure enough they were all almost touching. The one cylinder that I was losing compression in appeared to have no gap at all with the exhaust valve. Once I set the gaps back to what they should be the tractor did start but would only run with 3/4 choke for about 5 minutes and then was able to take the choke off. I had the carb apart so I am starting from scratch with all my settings. When I finally got it started it was below freezing. Would that explain why I needed 3/4 choke until it warmed up? Or might there be another issue going on? At no point would I say it was running great, but it did continue to run on its own. I know the manual says to not make any adjustments to the carb unless the engine temp is at 190 degrees, which it most definitely was not. I had to shut it off because I was afraid of being found on the floor of the barn since my barn doors are locked up for the winter!