Gents:

What battery cable wire gauge do you guys recommend? I’m shopping around here in the US and it seems 4 gauges is the norm. That is a bit thick, no? Looking at others’ build site, it looks like I can get away with using a much thinner cable, i.e., 8-6 AWG.

--Any advice is appreciated, Chris

chris - check an original blade if you can... though it's likely that particular wire may not be in your loom. Honda will have used suitable wire.
Bob

BTW nothing to stop you using 3 or 4 thinner wires in parallel provided they're crimped/soldered well.
Bob