In the past I also made kits for the governors that also lengthened the lower governor arm. It worked, but at that time I really didn't understand the mechanics and the physics involved with designing a governor system. After delving into the subject more deeply and researching the reasoning "why" these things work I now understand the underlying principles of their operation. It gets pretty deep into theory, as well as mechanics and math. In regards to governor regulation I canned the original linkage on the injection pump and redesigned it so that it no longer relies on the pinned yoke and clevis sliding in and out of a hole in the upper link. I eliminated all slop in the linkage and my design is rock solid. it gives total freedom of movement with no play. I will be retrofitting all of my engines with this design if I can get any more.
On the EPA front, I am making good progress with my testing. I now have a 10/1 that is easily compliant with Tier 1, and am close to meeting Tier 2 ratings. If I do get more engines the parts will be sealed with a stamp and any sign of tampering will void the settings, and MY liability. These engines will have considerable modifications, many of which are internal and not readily apparent to the naked eye. I have been in contact with one of my suppliers and he is coming to the US to review my findings and applications next month when my teaching job is over for this semester. In the past I have imported both IDI and DI engines from several manufacturers and will be dealing primarily with only those who have the capacity to implement the modifications. Some companies in India only assemble parts into engines, while others build theirs totally in house and have the capacity to change whatever is needed.