What would cause the L4 Kingston Carburetor to leak from the hole in the bottom of the carburetor Bowl?
I have reset has side drain on bottom. Center has a nut with a threaded shaft in the center of the bowl. There is a hole in the middle of the shaft that holds the bowl on to the main body. Fuel flows freely out of this hole when the fuel is turned on. How do I fix this leak?
Sounds like the float is either stuck in the down position, or the float has a leak and is sinking in the bowl, or the float level is adjusted too high, or the float needle and seat are not mating well.
If the float is stuck, some folks have had success with tapping the side of the bowl with a hammer to get the float unstuck, I have never been so lucky.
Here's a thread with Martin Vowell's great drawing of the Kingston L4 carburetor: http://www.mtfca.com/discus/messages/331880/375808.html
I haven't got any experience with Kingstons, but should there really be free access to the hole in the middle of the shaft where the bowl nut goes? Shouldn't the nut be an acorn nut / cap nut?
Roger, that hole in the bottom serves as a vent to the upper portion of the bowl, similar to the hole on the side of an NH. These vents keep the air in the bowl from becoming pressurized when fuel flows in, and will also be the source of an apparent leak if the float valve fails to close. Mark is right on in his diagnosis.
Ok, thanks - learning something new here everyday