This is all I can find on the engine valve cover. It is on an 2001 Exmark; 3 cylinder gas; water cooled & I need the s/n, etc. I am trying to find a 1 barrel carb for it. The Carb has this number on it: 878169J12. It is a manual choke & from what I can find it could be an Aisan Carb cause every Nikki carb that I have found is an auto choke. My search found nothing on how to find the engine s/n. Any ideas? I have sent a request to B&S service; but it may be days before I get an answer.