I have seen people use the 26 inch roadmaster granite peak before but its hard for me to tell what they did. The frame angle by the crankshaft is a bit more acute than the engine wants (48cc flying horse). IE the engine mounts are made for a bike with a less sharp frame and a more horizontal down tube and bottom tube. The engine mounts and universal mount are not quite flat with the tubes. I have not yet turned around the slant head to make room for the spark plug. I have yet to add an offset intake manifold. I was wondering how people deal with the mounts not laying flat on the tube and the general lack of space. Part of the mount to the seat tube is removable and I was considering replacing it with short polymer or something like that or grinding down the back of this piece so it makes the frame a bit less cramped.