batman wrote on 01/24/18 at 12:52:23:Armen ,I have no doubt that larger wires will produce less voltage drop, but do you want to rewire your harness with welding cable ? I believe the wire size used on the bike is a mix of size to carry load safely and manufacturing costs. the fact that the wire may not do the job as well as larger wire is compensated by the fact that the voltage from the alternator(14-15.5) is higher than the voltage needed by anything on the bike (12v.) allowing for the line drop. The fact that even in stock mod the battery charges to about 12.7 volts , shows that after all the needs of the bike are meet there is still voltage and amps left to do the job.
One might consider enlarging the wiring to the TCI (AKA CDI) and Coil to get a better spark at startup.
10v at the bat will be knocked down more at the TCI and coil.
It does have to run all the way to the right control, then the left, and safeties before the wick can be lit.