Is that an aluminum frame? looks like it. I tried using them in a few of my builds and almost every one came back cracked. Aluminum doesn't seem to hold up like steel. Unless I'm building it to race, ( for the weight savings) I wont ever use a tin foil (no offence meant) frame again. Vibration seems to break them at the engine stress points. I have busted a couple of steel frames too but they were rode hard and put away wet by real big guys jumping curbs and such. I guess some people have had better luck than me with aluminum. For now, I'll run with steel.
Big Red.