stock Kohler coil has 5 ohms of resistance through the primary. 3 ohm coils will work ok if you have the larger diameter condenser. the newer ones don't seam to have the capacity the old condensers had. the GM coil that looks like a Kohler coil that seam to always find its way onto Kohler's is 0 ohms . now on a GM they use a resistance wire between the coil and the points to prevent points from burning which is what will happen to a Kohler, you may also have trouble getting the engine to rev up with a 0 ohm coil because the points are arcing so bad.
Chrysler products used a resistor on the positive side of the coil to reduce the voltage with a NO internal resistor coil.
secondary voltage I've not seen gains or harm from them. I've run those big ass yellow Accel coils on Kohler singles. looks real cool. but that's about it.
My opinion is to just find a used one for $5 or so, they don't fail that often
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