I had one of these engines back in 2000. One of the sweetest running engines I have ever owned. At first I too had issues with RF and the little Briggs and Stratton type plug clips. My fix was a set of wires and caps off an old 3W ignition. Speedy, you are correct in that the old plug wires can be pulled out and new ones simply pushed in. Once you get the old ones out you will see a sharpened pin for the new wires to insert into. The new wires will most likely be a smaller dia. I just put a couple layers,of shrink tube on the ends to build them up and the a bead of Goop for added security. I did solder some wires to the braid and crimped on some lugs to attach to mounting bolts. Worked like a charm, that airplane had hundreds of flights with a pair of Hitec Supreme FM receivers.