Thank you very much for the tips! I just got in my filler metal and Will shoot to do the repair tomorrow or later today and I will take pictures of the results!

Hello, i just purchased a go kart and the engine that came with it has two cracks on the coolant passage. I was curious if i would need to take something and grove out the cracks before i try to tig weld the cracks? Any help or opinions would be greatly appreciated!