The Hercules Engine News


| August/September 1999



Wico Magneto

20601 Old State Road Haybstadt, IN 47639

The question comes up quite frequently about WICO EK magneto systems. The following discussion will be as it applies to small size Hercules built engines. There are several things to consider. While this is not a detailed account of the magneto itself, there are a few basic things to keep in mind. The armature bushing should not be loose on the shaft. When it brakes, both sides should pull away from the magneto contacts at the same time. The points needs to be clean and free from oil. The magnets need to have a strong charge making it difficult to pull the armature away by hand.

Even though the magneto is in good shape, that does not necessarily mean that it will operate well on the engine. There is the matter of adjustment, wear and sluggishness of the tripping mechanism. The screw and bushing in the armature should be tight without any play. The slot in the tripping rocker arm should not be worn excessively. It is important to have the proper springs in the tripping mechanism. Any sloppiness of the side rod or the trip finger mounting needs to be corrected.

The following information is taken from the operators manual that will explain the whole adjustment process.

The numbers on Figures 15 and 16 will be used in the instructions on adjusting Wico magnetos. Figure 15 is a cut of a type P.R. showing the position of the trip finger No. 407 and armature No. 100, just before the contact between armature No. 100 and the face of the cores No. 107 has been broken. Figure 16 is cut of type E.K. showing position of the trip finger No. 407 and armature No. 100 after the contact between armature No. 100 and the face of the cores No. 107 has been broken, also at the point where trip finger No. 407 trips off of rocker arm No. 412 causing armature No. 100 to return to its original position.

Note--Type P.R. and type E.K. magnetos are alike except in size and the location of spring No. 97. Therefore the instructions on Wico magnetos will apply to both types.