I have a 912ul that came on a partially built Model IV with a vacume pump installed. I've decided not to use it but I'm unsure about removing it. I know that for it to be installed that extra parts were installed in the gear box. A Rotax repair center said I should be able to remove it without any problems, that it shouldn't leak. I would feel better if I, at least, have a cover to go back where the pump was installed.(Is a cover available?) I can leave it in place but I would rather remove it to save weight. If any of you have knowledge of what's involved I would sure appreciate your advise. Thanks, James Thomas