do you have to use one ?
No, if you change to a non-resistor type coil, or go electronic ignition.
Which coil is that? I bought a Mallory coil that wasn't suppose to need a resistor and it fried. That reminds me, I need to send that back for replacement.
If i get some free time tonight at work, ill play with it and post it for everyone to see.
Time to man up and yank it John! Ray