A turbo would be a fun project. I live at 6200' elevation so even if I could boost 3 psi that would help a lot. My tractors will puff quite a bit of black smoke under load so until the black smoke is gone I wouldn't have any reason for more fuel addition. Seems like there is a "smoke setting lever/arm" in the pump that may allow for more fuel but I'm not that familiar with it and its adjustments. What do you plan on doing for the oil supply to the turbo? Keep us posted on the progress, I'm interested in how this works out. Not having done a turbo before, I'm thinking the KE series engines may be easier to turbo than the K3 since the KEs have both the intake and exhaust piping on the same side. It's just a pipe routing problem though either way I suppose. Also, what turbo do you plan on using? I looked at a couple on ebay that seem like they would work. What is your final goal for the project in terms of power output? Running boost/extra fuel on these engines can (will?) shorten their life, cause increased probability of failure, and excessive transmission stresses that can lead to broken components. Good luck!