Loan, thats what I was guessing it was- a C-H ignition or equivelent to use with glow. I have one like this setup on a saito 150, complete with sparkplug that runs on glow fuel. It makes starting my engine easier, lower idle rpms and increases your top rpms just a little. I wonder why someone would have installed this setup on a YS? They are such great engines to begin with. Oh well
Best of luck with yours.
John