I have made a very big change to my 601 XL I have sold my Corvair engine and have purchased a Rotax 912S (100hp) There is not just one reason for this change but I have made the change and I am happy with my decision. The new motor has helped me get back into building. The Corvair has moved on to an 601 builder in Qld Australia. I an now waiting for my Rotax FWF kit to come form the Czech Aircraft Works as Zenith USA have said they are not suppling Rotax FWF kits anymore. I wish Zenith would update their web page etc.