mr_flintstone
Member
I have a 1958 641 that came with a Marvell TSX-765 carb. A few years ago it started leaking fuel out of the gasket, so I ordered a rebuild kit. It was really dirty, so I cleaned it, replaced the butterfly on top because the old one was chewed up for some reason, replaced the needle and seat, ran wire through the main jet, etc... After that, it ran perfectly, but I have to set it to idle at about 8-900 rpm or it would die.
Some time after that I picked up a Zenith 13878 carb on sale. It is the kind with only a fuel adjust screw (no air adjust). With it installed, the tractor idles perfectly, but it seems to run too rich, and I don't have a manual for how to adjust it properly. After I get it where I think it needs to go, it runs good for a week or two, and then starts running rough, and the plugs get dry and black.
Could someone tell me what I'm doing wrong on either carb in order to get the tractor running the way it should?
Some time after that I picked up a Zenith 13878 carb on sale. It is the kind with only a fuel adjust screw (no air adjust). With it installed, the tractor idles perfectly, but it seems to run too rich, and I don't have a manual for how to adjust it properly. After I get it where I think it needs to go, it runs good for a week or two, and then starts running rough, and the plugs get dry and black.
Could someone tell me what I'm doing wrong on either carb in order to get the tractor running the way it should?