ok, ty for getting back to me. i rebuilt the hydro on mine, so far so good, parts for it were high dollar !. never owned , let alone worked on a tractor until i took this girl under my wings a couple yrs ago. it was so much fun splitting it..lol. the only real problem i ran into was the one large back steel plate ?, it was discontinued back then. sooo..with a little help from jb weld, some fine sanding, i was able to salvage the steel plate. if that one b2100 with the bad engine has a good hydrostat transmission ?, i wouldn't mind taking it off your hands for a good price ?.