You'll have to get underneath to get her exactly on TDC. But first, pull your coil wire on the mag or at least make sure the ignition is off.
Pull your #1 plug and have someone crank the engine slowly by hand until you start to feel the air blowing out by your finger as you stick it in the plug hole. Take a light and crank slowly until you see the #1 piston near the top through the hole for the plug. When it's close you can move it back and forth by hand with the fan blades.
Then crawl up underneath and look through the hole on the bottom of the bell-housing/torquetube. You may have to remove the cover which will likely be held in place by a wing nut. Look up and a little forward through that hole and you'll be looking at the bottom of the flywheel. It's often obscured by rust, but there is a fine line stamped into the flywheel, running front to back. If you have it all cleaned up it will also be marked TC1-4 near that line. If you've got the piston as close to top as you can eyeball it through the plug hole, you should be able to find the line near the bottom of the flywheel, even if it takes a little brushing to clean off the rust to find it.
Just ahead of all that, still looking up from underneath, is the backside of the cover on the lower half of the bell housing. There is an easy to see, very pronounced nub inside there on the back of that piece, about even with the edge of the flywheel. When the line on the flywheel is lined up with the center of that nub you're at TDC, and can get on about the business of timing your mag.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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