What is the difference between the B & S 11 HP engines below? I have the first one in the list on a JD 111. It is the original engine and now needs to be rebuilt and have the governor repaired. I thought I might be able to get another engine and have located the second one (used) in the list. Model 252707 Type 0644-01 Code 82092911 Model 252707 Type 0620-01 Unknown I also looked at smallengineswarehouse but they don't have an exact replacement either. Their webpage says I would have to use parts off of mine (stator, etc. since I have an electric PTO) and it is almost $500. Thanks BTW, which model/code/type would I need if I was looking for a 11.5, 12 or 14 hp replacement?