56 KHK plug preference

[TheShopVancouver]

I recently acquired a 56 KHK.
Beauty of a bike but she decided to spot firing on the rear head.
I pulled the plugs (Champion K-12G)
I was wondering what modern people are running on the KHK's
Thanks
T

[EKHKHK56]

Great looking bike! B6HS NGK is one I've used often when I used to ride. Or an Autolite equivalent. A middle heat range seems best. Harley had #1-#5 with a #3 being about right for these Ks. Erik K