...One of the motor mounts is cracked up...
Im not 100% sure what motor mounts you are referring to. If it is the metal X mounts, there is no fixing it, they need to be replaced. If you are referring to the wooden motor mounts, that come with a speed build kit. If glueing is not working, replacements available through the FT store.
I make my own wooden mounts. Most any thin material will work, like a scrap of 1/8 inch paneling, the stuff you get at a lumber yard for a den or family room. At the moment, I'm using paint stirring sticks. The heavy duty ones for a 5 gallon bucket of paint. I got mine from Wal-Mart.