Ok, I would suspect if start up and rev-up are the same I would replace the gauge, cheap and will tell you if it may be a weak oil pump. As for blow-by every engine has some and is subjective as to how much you have. Just watch it and you will see some,if it looks like a sketter fogger its not,but not a death sentence either. I had it real bad on a N and I cut it down by 75% with a transmission fluid soak. First get a new gauge it may tell us the whole story as lets not drop the pan and fix whats not broken. Post back what you get. 80 on a dry compression check is NOT bad as 90 to 125 is normal. At this time let do simple. Theres a lot of top notch folks on this site and can save ya time and money. Let see what others have to say.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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