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willie- Welcome to our world. I'm concerned a lot about #3 cylinder having only 75 pounds while others have 115. Think of riding a bike with only one good leg. Your good leg has to work extra hard to make up the lost power. With that much disparity, you're gonna wear out your engine quicker. Since the tractor's been sitting awhile you could have stuck or broken rings or stuck valves. Do a wet comp check on #3. If it comes up more than 3-4 pounds, your rings are suspect and put some (tbspn) MMO or other in the cylinder,let sit for a day or two and try comp check again. If no improvement, drain oil into a clean pan and take it into the sunlight. Look for shiny particles in your oil (evidence of broken ring among other possible metal deterioration). if no shinys and if you don't want to check further into cause, be prepared for headgasket failure. Know the signs so's you can shut her down. If wet comp results do not increase more than 3-4, you have a stuck valve. Pull that valve cover (one on left) and squirt MMO on the #3 valves and lifters. Hand crank engine with SWITCH OFF rotor/coil wire pulled off and look for proper for valve action. Recheck valve lash while you are at it. If not going up 'n down fully, you can try to free it with a screwdriver. If unsuccesfull, you call whether to do valve job. Just remember that that disparity in comp, if left uncorrected, can cause accelerated engine wear/headgasket prob.
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