Posted by used red MN on November 08, 2023 at 22:16:07 from (68.46.31.28):
In Reply to: Re: Cub not starting posted by rustred on November 08, 2023 at 18:50:16:
I looked back at some of your other posts trying to get a feel of your knowledge level concerning ignition timing. I want to make sure you understand some things about this. Rustred said get it on TDC of compression, that means the compression stroke of the piston. This means it has to have both valves closed to push air out or build pressure against your thumb and then the piston is brought to the top and the timing marks aligned for timing your mag. Every other time the piston comes to the top of the cylinder it is on the exhaust stroke. It will not push pressure on your thumb on that stroke because the exhaust valve is open. The last thing to be clear on is to make sure the number one piston can pump compression. Do that by pulling the plugs and cranking it over a couple time to make sure it will build pressure against your thumb. Valves can stick on engines that set for a time. Be a good idea to pull all the plugs and check for some amount of compression in all of them. That way you know if that is an obstacle keeping it from starting as well. You have a manual for this tractor? If not go to Farmallcub.c.. I bet you find one there.
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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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