Just noticed mine leaks there as well. I can't get it to stay running no matter what needle setting I try. So I tore it down to see if the spring was still on the new clutch shoes I just put in. Sprayed wd40 in the glowplug and carb areas just to keep lubed. Notice it leaking out just behind the flywheel underneath.
Guess it's toast? Never once held a tune since I got it new.