12oz is OK, probably will not give you any trouble.
The Baja DB30 manual says takes approx 12 oz, as I recall. But, if you check the conversion from quart to liter is wrong in the manual and understates the oz quantity. I believe it really calls for approx 15oz. I add approx 15oz, and have never had any leak out.
Also, this engine is Honda G100 clone and the Honda G100 takes 15oz.