I just thought about this.......I thing i know when the crack started. when i was messing with that Demon carb, it was to lean at the top of the rpm and would start to pop(banging is probably a better description) I had to jet it up a lot to fix the problem.
There is all ways one cylinder that's leaner, then the rest and that cyl must of been #4.
There is all ways one cylinder that's leaner, then the rest and that cyl must of been #4.