#5. I was just inside that little grommet two days ago.
I am thinking that your wires are not the right colors. they certainly aren't for a Grande anyway.... To get to the inside of that grommet. you have to take off the drive pully and carb, drop the engie, take of the fan shround, pull the flyweheel off with a puller and then you may access the wires. IF you choose to do this ( and I wouldn't unless you have to)...you should also buy a new condesor . points and crankshaft seal.
Once you have the flywheel off it's a breeze to change them, and you might as well do it all right the first time.
Quwstion #4. I am thinking you are correct in your assumption that the white wire to the coil goes to the spade connection near the 2 wire grommet, but the moped I've been working on is a few miles away.
I wish I spoke in any other language as well as you do in English.