I would say yes, to keep their same 98:1 turns ratio. I took apart both an old 6v/0.6 ohm front mount coil and a newer so called 12v/2.5 ohm front mt coil. The primary wire diameter in the 6v was 0.025 inch and in the "12v" was 0.0179 inch.
Wire size difference, while keeping same number of turns, isn't enough to gain the (2.5-0.6)=1.9 ohms, so my conclusion was that both changes were made (more turns & smaller wire), at least for these two examples. No I didn't try to count the 170 (?) primary or 16,500 secondary turns. Nor unwind 75 feet of primary out of those little windows or the 6,000 feet of 0.003 in. secondary wire which has to come off before you can get to the primary. :wink:
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