John,
we have received our first EPA certified Farm Pro tractors from HOmier. The Y380 and Y385 engines appear to be the same except for the EPA lable. It appears these engines passed without modification, at least visible, even still has crankase vented to atmosphere which surprised me, but it could be that the requirements for less than 25hp are fairly easy to meet, I think they only need to meet teir I at present. By the way, The two year warranty Homier went to is the result of an EPA requirement. Certified engines are supposed to have longer warranties.
I also have a KAMA TS354X in stock with EPA TY395 engine in 35HP trim. Quite a bit different, uses EGR valve and some type of pump on rear of alternator with lines going to lower crankcase. It is obvious that a fair amount of work was expended brining this engine into tier II compliance. I know the 30HP version is less expensive and does not have the electronic engine controls the 35HP version uses, but I have not seen a 30HP first hand yet.