Bernard,
914 and 912 engines are pretty much identicle, except for the 914 specific components. (Turbocharger, intake box [plenum], TCU, and necessary wiring and associated components). Any Certified IRMT that has been through an approved Rotax training course, should be able to help you with whatever problems you may have. I'm located in North Idaho, but I am currently on vacation. You should be able to find someone closer to your home, I would think. If you're dealing with Roger now, he should be able to answer all of your questions, and work through any problems you may have.