The stock CB750s ignition wires are molded into the coils like the CB550 was. I always thought thery were the same between the two models.
Replaceable ignition wires weren't stock fare until later Honda models after the SOHC4. These often had electronic ignitions, too, with lower resistance primaries in the corresponding ignition coils.
Yes, these can work. They will also put greater demands on the stock points and draw more power from the bike's electrical system.
The stock 5 ohm coils draw 2.4 amps of the total going through the main fuse.
3 Ohm coils will draw 4 amps of the total going through the main fuse.
2 Ohm coils will draw 6 amps of the total going through the main fuse.
1 Ohm coils will draw 12 amps of the total going through the main fuse.
If you go with coils with very low primary resistance, you could blow main fuses. Particulary if the fuse clips are oxidized, causing extra heating.
I could go on. But, there are too many variables at this point. Bike? Specific coils? Other bikes mods? Specific goals?
Hope this helps,
