This is a list of the Wisconsin Fairbanks Morse magneto's used
over the years and is listed alphabetically by Wisconsin engine
On the mag plate you will find a number satrting with "Y". That is the Wisconsin part #. The number below starting with "FM" is the Fairbanks Morse part #. We need all the numbers to insure we are quoting you on the correct parts.
If you remove the large cap exposing the points and condenser and find there is NO OIL residue in this area then most likely you do not need to overhaul your mag. If there is oil in this area it is indicative that the ball bearing and/or oilite bushing is worn out and the excessive side play in the rotor has allowed engine oil to contaminate this area. With the high heat generated by the points arcing when they open and close oil tends to "bake" on the tungsten point contacts and this hard coating does not conduct current flow. This needs to be corrected by completely overhauling the magneto. We usually charge about two hours labor for the complete overhaul plus parts. Turn around time is about 2-3 days from the date it arrive in our shop but can be repair within 24 hours if it is an emergency.