TN-26 Spark Plug

[William Harper]

I have a 1950 TN-26 with no spark. Coils have almost 4 ohms, condenser tests good, Wires have continuity, Rotor is magnetized. I must be missing something and I can’t figure it out. Do these motors have some sort of ignition switch when you the throttle all the way off to stop the engine?. Also, I saw some sort of (Oil Wiper) next to the coils in an instruction manual that I don’t see on my motor. I keep thinking I’m missing something simple.
Bill

[Tubs]

Points connected to the wrong coils?

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.

[frankr]

If I remember correctly, the do have a switch that turns it off when throttle lever is at extreme left. But that probably is not the problem. Most of those things will run just fine by simply cleaning the points. Don’t just clean them, CLEAN them. That means remove them from the motor and take them apart, degrease everything, and polish each contact shiny bright, individually. Reassemble and set gap to 0.020″ at widest opening. Do one set at a time so you have a sample of how they go together. And don’t lose any of the small insulators.

[William Harper]

Well I did exactly what you said and removed and polished the points as well as all the other terminals until they were shiny and guess what? Tons of spark! Thanks guys.

[William Harper]

This motor just ran for a brief moment. The carb leaks around the primer and squirts fuel out of the front near the low speed jet. Is there a carb kit for a TN-26 or do I need to improvise?

[frankr]

Lloyd will probably check in here. He makes repro primer seals.

Some backspray out the slow speed jet when priming is normal (to me, anyway)

[aquasonic]

Backspray out of the low speed intake while priming is normal and a sign of a clean low speed system in the carburetor. Then there is a low speed “sneeze” while running, that is usually a sign of a lean low speed needle setting.

[lloyd]

Look below for the “1939 Johnson 5 HP” Instructions for ordering new primer seals and installation instructions are provided in that thread. You may also need to test and clean out the one way ball valve at the bottom of the carb that takes fuel up to the low speed orifice. Spray out of the low speed orifice is normal when priming as Frank noted above. 231-929-7479

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