I have a 79 model that I bought a few years ago. It ran fine for a while, then one of the carbs started leaking and I can't get it to stop. I replaced the floats and that didn't help. Both sides don't leak, only the side that's connected to the left side petcock. I swapped the lines and it made the right side leak. Should I try to rebuild the petcocks? I'm pretty new to this.