Ty, the red plastic fuel cap says fuel to oil ratio 25:1 or 20:1. Incidentally, carburetor is a Walbro WA.
Deejay, it was easy - that is the only line trimmer I own at present. Ty's picture looked familiar, so I looked at the machine, found it matched, and took a couple of pictures with my phone. When I bought the machine on ebay, it came with the original box of accessories, plenty of spare line, interchangeable aftermarket line head, plastic blade, and a military jerrycan of fuel. One of the accessories was the owner manual. Cost me $20 all-up.
