you know YS is as basic as any other glow engine. no special stuff. dont let the regulator scare you. its just a silicon diaphram..

If anything is wrong with the YS its the same suspects as an OS or a saito.

if something is not right, its probably a problem with fuel delivery, fuel itself or the glow plug...

If there is, just fix the problem yourself or let one of your experienced buddies do it for you.. for free..