Randy, that's an interesting idea. I wouldn't have though of that. In the case of my Flair Legionaire I need to be able to recess the engine+mount (Saito 56 with standard nylon filled mount) a full 6cm. So imagine it might be a bit much to put a 6cm thick block of wood up front.

I have consider using the method recommended in the instructions, namely bolting an aluminum plate directly to the back of the engine crankcase and then screwing the plate onto the firewall (thereby eliminating the mount entirely). Doing that would cut off nearly 5cm in length (not to mention weight) and require only a few cutouts (and small box) around the carb. But I don't really have any experience or confidence with this system. Plus with the lenght of the Saito and the shallowness of the cowl I'd still have to recess the firewall a bit -- though Randy's trick would now work.

And of course the engine+mount makes for a very long unit that will necessarily push the other component further back in the fuse in the fuse which can only be a bad thing.