Darren, it could be the float adjustment. It could be too much pressure from your fuel pump (which can cause your needle and seat to not seat properly). It could be the rebuilder used a seat with too large of an orifice diameter (which will cause over-filling of the float bowl and flooding). I'd guess the airhorn is warped and maybe also the float bowl. Not to throw mud at National Carburetor in any way but they're just a commercial rebuilder and I'd be very surprised if they had straightened the castings. Usually an improper float adjustment and/or too much fuel pump pressure are culprits but gasoline will wick up all over the place inside the carburetor and will seep out of that seam if any irregularity exists. Somebody somewhere might suggest using two gaskets. If that happens, please resist the temptation. It won't work and the fact this carburetor only uses 4 screws to hold the parts together is what causes trouble in the first place...the corners get pulled downward and that causes the area between the corners to bend in an arc. Good luck! Please let us know if we can help.
PS...maybe just an optical illusion but it looks like teflon tape was used on the fuel line inlet threads. I'd remove that if it was used there. Teflon tape has a tendency to shred off in small pieces and those can wind up in the small passages of the carburetor.
Last edited by Jon G; 10/29/2023 8:50 PM.
