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Has it been mentioned yet to check the condition of the wire clip inside the boot and its connection to the spark plug wires core?
The wire clip terminal inside the boot is prone to corrosion from moisture and the pin on the clip can rust or corrode completely away causing a weak or no spark situation. Since the spark plug on this motor is exposed to the elements, I’d check it before going any further on this motor. If the second plug had a weak spark, it could be from the clip inside making an intermittent connection with the wires core and when the wire is bent to its installed position, there may be no electrical continuity at all, or in other words, no spark.
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Since your waiting on a spark checker. You could be doing these while waiting their just suggestions to see if you can improve your spark.
I’m going to post a few tools and tricks I use to get a hot blue spark every time I have been taught many of these but they pretty good ones.
I am posting a pic of a new old stock techumseh coil here which is most likely like yours notice notice their is no plug wire in it like the new Chineese jobs these days. Their is a metal spike in the center of where the plug wire goes and their normally shaped like a wood screw so you can turn your plug wire into it while pushing it in and it bites in and won’t just pull out. That is normally a place where the wire inside the plug wire copper strand rusts, burns off etc.
https://www.ebay.com/itm/NOS-tecumseh-2 … XQySpROMFx
If you try and unscrew your wire from your coil while gently pulling it out then once its out take a look to see if the metal inside the spark plug wire is burn or rusted. Napa might sell you a piece of spark plug wire 7mm with a copper core like 1 footlong if not I normally shorten the wire on the coil end like 1/4-1/2 of an inch depending on how long it is and how much I can cut off without making it to short then I screw it back into the coil.
Now on the other end where the spark plug boot goes I normally spray it with wd-40 or some type of oil to help the plug wire to pull out of boot. I also use a small screwdriver and pushing the metal spring clamp outward while pulling on the spark plug wire. Sometimes the plug wire just rips off but I then work the metal spark plug clamp out of the spark plug boot with a screwdriver and some needle nose pliers. I shorten it on that end like 1/4 inch and leave a little of the copper wire hanging out so when I re-assemble it in the actual wire is touching the spark plug clamp see pics. This helps a bunch with energy delivery to the plug The pics will help you see it. If you can’t get a new piece of spark plug wire at least use electrical tape and tape up what you have after you make repairs on both ends of the plug wire.
I am also showing you a cheap spark plug gap checker their available at places like harbor freight I have the one in picture adjusted to like 1/4 inch of fire jump the alligator clip goes to ground.
Clean all the magnets on flywheel, clean the ends of the laminate shoes that’s the part that almost touches flywheel while it spins should be 3 spots, clean your ground wire terminal and the screw where it goes thru the condenser make sure condenser is grounded well also you can see those wires in the picture of the coil. Clean the terminal from the coil where it connects to your points.
Hope that helps,
Joe
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