Posted by Ken Christopherson on January 14, 2019 at 00:52:39 from (156.98.247.156):
In Reply to: Magneto ? posted by WW2N on January 13, 2019 at 21:32:03:
Magneto's are timed internally, SEPARATE from the engine. Once the magneto timing is set, you do not have to do anything to it - just bolt it on. This is NOT like a distributor. I would guess the gent you sent it to is reputable, and knows what he is doing. I work part time in a magneto/distributor/carburetor shop (doing carburetors).. But know a little about magnetos as that is all I run on my tractors. In order to install a magneto on a tractor, bring whichever cylinder you want to TDC on the compression stroke (preferably #1 cylinder)... Then ensure your rotor is pointing to whatever mag cap terminal you are going to run your wire to #1 cylinder. The numbers on the cap make NO difference (it only matters where your rotor contact is pointing to). Even if you get it wrong, you can rotate the wires either 90 forward, 90 back, or 180. (I have a habit of being 180 out on my timing - usually the more common issue)... Easy to correct, though. If you want to worry about your "#1" marking on your cap being correct with the #1 cylinder - pull the mag off, and cycle it until the rotor is pointing at the correct terminal. If you are 180 out, cycle it twice, and reinstall. The more challenging is when you are 90 degrees forward or back (although still not difficult).
At the shop, we get customers all the time who say their magneto timing is off, then they pull the magneto apart and start messing with the INTERNAL magneto timing gears.... My shop owner has even made house calls to his local customers to show them how to install a magneto because they SWEAR it is the magneto. EVERY time people seem to get so bent on what position the magneto is in. It only matters where the rotor is pointing to, and where you are running your spark plug wires. In a nutshell, whatever cylinder is on TDC of compression, run the spark plug wire from the terminal that is next to fire to that cylinder. Then, follow your firing order in the correct rotation of the magneto.
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