This is how I bench test a mag. I learned most of it from this site. 1. Get a 3/8 drive socket to fit the nut on the drive end of the mag. 2. Cut a 3/8 drive extension in half. 3. Put the half of the extension with the male end into your electric drill. 4. Put the socket on the end of the extension. 5. Put a spark plug wire into the mag and place the other end close to the frame of the mag. DO NOT hold it in your bare hand!!! 6. Use the drill and socket to rotate the mag the proper direction. 7. A good F-4 mag will produce at least a 3/8 inch spark
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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