Be gentle – the high voltage wire is tiny to get the number of windings in there for the needed high voltage. The wires are soldered to a "L" shaped tab that is taped to the coil. Excessive heat can damage the tape. Pulling or twisting can damage the connection. I clip the old wire (If soldered) leaving solder on the coil. Pre bend the new wire so the tinned end rests against the coil solder. Then touch the iron to the wire just long enough for the solder to melt around it. Good connection – no strain on the tab. . . 😉

Look around, TD 20 coils can be had from parts motors all over the country. These are nearly the same motor. The most obvious difference is the dull aluminum paint and the harder cast gas tank, and the post war motors all had recoil starters (I think). The cast tank is why the earlier TS motor’s tanks aren’t all dented up, like the later TDs. The decals are a little different , too. After WW2 they resumed building these 5 hp motors with a Sea Mist Green paint job and a few other changes I mentioned. They were extremely popular and can be found everywhere.