I have a 91 FX that is really starting to get me down. There is a constant flow of air bubbles in the fuel line from the needle valve assembly to the carb. I have tested "everything" for leaks and found nothing. The only thing I can see, is possibly the vibration is causing the problem, (I've used numerous balanced props with no difference.) This engine vibrates more than any other I have ever seen. Is anyone else having these problems, and has anyone fixed them???

Thanks Greg