Here is something else that I was going to try on the Hanriot, but it just didn't work for me. I was able to reduce the overall length of the Saito 180/mount combo by sliding the motor back on the mount, after removing the velocity stack from the carb. Is your Saito similar? The front hole of the engine lug is in the back hole of the mount. The location of the front hole in the mount is marked in black. This saved me almost 1/2" but it still wasn't enough...

If the first picture is still here it is because I don't know how to delete it....the second picture is the Saito....