getting alot of black exhaust am i useing wrong oil?

Probably not broken in yet. My G-38 and G-23 both spit black specks for quite a while. It can take as many as 2-4 gallons to break a Zenoah engine in. I use Amsoil at 75:1

Dr.1

Hi,
Is it new? Breakin can cause this. Follow recomendations for breakin if new.

Dave

THANK YOU