that be a sure fired Deutz someone put that in their no problem it fits they are good solid motor my 873 has one a 1011 series that is a older f 4 L or 3 L series I cannot see how many cylinders it has a four will have 70 hp a three will push 50 plenty for that machine those narrow army tires will hurt on traction though, on that modle motor you will have to pull the cover on top of the motor and keep it washed between the cylinders to prevent build up and hot spot on cylinder more-------------------dave---------------------I got to looking at that green paint on that motor Deutz is grey tha is lite green it may be a lister motor we may have to see the SN to verify that will be on the inside of the cover I mentioned