I have a '72 140 with a Kohler K321 engine. When I had it running it would start up with no smoke. I just started to do some work on it and found the carb flange was broke so I removed the carb and then did a compression test. The compression test result was 118#. I'm not sure if the engine was ever rebuilt or not. Question is should I do a leak down test? I don't have a leak down tester so I'm not sure what to do. The leak down tester I was looking at is around $65.00. I'm planning on restoring this tractor as time permits so it's going to be a slow go. So right now I'm seeking your opinions on whether I should buy the tester and do the leak down test. TIA for your help.