My later B10 has the 243341 B&S engine. Yours should be the slightly bigger one for 12 hp. It should be the same engine as my MTD 1200. I'll go check it. Meanwhile, look for the B&S Repairmans Manual. Good Luck, Rick
It is probably in the 300401 to 300424 series. In my opinion you are better off pulling the engine out, pulling the shroud and cleaning the engine are a good start. I have found that mice really like these engines an build nests in them every winter. The young chew on the wires and piss on the coil causing corrosion and shorts. When I pulled the engine on my son's B10 two years ago, there were two layers of mouse nest and a 4' snake skin in the shroud. The cooling fins were totally plugged and would have overheated the engine if it had started.
While you are that far along, consider overhauling the engine. Thorough disassembly and cleaning can head off impending failure and help it run better. Lap and gap the valves. Good Luck, Rick
I found the tag on this engine and the numbers are gone. This was a sticker tag, not what I am used to with a briggs. My question is, would the range you gave me be good enough for ordering parts such as gaskets, points, etc?