[jpnovak]

the rotor mod is easy but not always necessary. If you look at the top section of the stock rotor you will see an area covered (potted) in epoxy. There is a resistor inside the epoxy that may not hold up to the extra voltage supplied by the MSD. If you run a larger gap, and thus a higher output voltage to make the spark jump the gap the resistor can quickly be overload. This means it will disintegrate and you have very poor performance. The epoxy section will sometimes be bubbled or even discolored depending on the amount of heat the resistor took in. the resistor is for RF noise abatement and not needed.

the solution is to take a dremel tool and mill away the epoxy. yes, you will likely zip right through the cooked resistor. Not a problem. Keep cleaning the epoxy our until you find the center brass contact and the outer brass contact. There you will find some solder where the resistor leads have been attached. Simply unsolder the resistor leads and bridge both contacts with a small section of brass or Cu or similarly good conductor. Test continuity with a Multimeter before filling it with epoxy. problem solved.

btw, the orange bakelite material is quite a bit harder than the epoxy giving you a built-in stop for the dremel milling step. Go slow, its easy to cut. Sometimes you can mill around the perimeter and pop out the epoxy slug depending on how bad the resistor blew up.