Lukas. Glad to see you are going, apparently with the er 6 engine. When i had mine, i was playing with the idea, of havin that engine in a dirt bike. But i saw one problem. The oil sump under the engine, extends quite low. When you have the engine in the Ktm frame the sump will probably go lower than the frame rails. I think it can bee fixed. The piece that goes low in the sump, is the area that has the drain plug in it, i think you could cut most of it away and make a new thread for the drain plug. If i remember right you can un bolt the sump without splitting the engine, so it should not be too bad to do. I hope! Anyway good luck with the build!