Re: hello from New Zealand (the pimple on the bum of the world)
I would never have thought NZ described as the pimple on the bum of the planet as there are some truly festering places best kept out of sight, but NZ is surely not one of them. I have never been there, but of the places on the planet I would like to see in person it is near the very top of the list. You are fortunate to be there, but you know that.
I don't think the color of the engine makes much difference if any. The CDI units I have had were such that the wire could be turned (unscrewed) from the unit. I have used wires & caps from automobiles with good experience. Being free the price is right, too.
Welcome to the forum. There are a few Kiwis and a number from the land of Oz. You are in good company.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...