Echo tells me that there are three models comparable to the John Deere 250G.The SRM-200AE,SRM-200BE and the SRM-2200.Based on it's apparent early serial number mine looks like the SRM-200AE.It looks like most of the parts for this model have been discontinued by Deere and Echo.I can't even find an air filter for it.Perhaps i can change the air cleaner housing to a newer style.If i find some valid part numbers i will post them.Maybe this will help someone in the future.Thanks everyone.