Ford 641 Wrong Carb

[Arroyo]

I was having trouble using my 641 with a box blade this weekend. Whenever I went up hill pulling the blade, the tractor would start to miss and backfire, then cut off. I checked all the potential ignition problems and finally narrowed it down to the carb. After I disassembled it I found the floats was bent and one side was sitting really low in the bowl causing a low fuel level, all of the gaskets looked bad and the emulsion tube was corroded, so overall it needs a rebuild. According to the tag it's a TSX785 which as far as I can tell was not used of the 641. I know carburetors are pretty generic, and I'm not concerned about originality but should I replace this carb with the TSX765 which is correct for my tractor? Or should I just buy a rebuild kit for the case tractor this carb was used on? If it's going to affect how the tractor runs, I'm willing to change it out but if they're virtually the same I don't see a need to spend the extra money. Thanks for any advice!

 

[Arroyo]

I hadn't gotten any responses, but I thought I'd give an update in case anyone was interested. I've decided to replace the carburetor that came on my tractor with the correct MS TSX-365. I thought about rebuilding the carb I have, but I figured that then I'd just have a better but still wrong carb on my tractor. I found a MS pdf that lists all of the various carbs and the TSX-385 is listed for various Case tractors. It seems to me if the two were interchangeable they'd have the same model number so something is different between the two. I have found that the complete overhaul kit is not very available for the 785 carb but is common for the 765. There are also a lot of reproduction carbs that are listed for the Ford 641 that have a tag that says TSX-785 on them, like the one I currently have. I don't know if there is one company in China making these carbs, but every website that I see uses the same picture, I don't know why they went with the TSX-785 number when it's obviously wrong. If anyone has a cast iron TSX-765 in rebuildable condition, please let me know. This site didn't have a rebuilt unit in stock due to a lack of rebuildable cores.

 

[JMOR]

(quoted from post at 13:21:23 04/03/19) I hadn't gotten any responses, but I thought I'd give an update in case anyone was interested. I've decided to replace the carburetor that came on my tractor with the correct MS TSX-365. I thought about rebuilding the carb I have, but I figured that then I'd just have a better but still wrong carb on my tractor. I found a MS pdf that lists all of the various carbs and the TSX-385 is listed for various Case tractors. It seems to me if the two were interchangeable they'd have the same model number so something is different between the two. I have found that the complete overhaul kit is not very available for the 785 carb but is common for the 765. There are also a lot of reproduction carbs that are listed for the Ford 641 that have a tag that says TSX-785 on them, like the one I currently have. I don't know if there is one company in China making these carbs, but every website that I see uses the same picture, I don't know why they went with the TSX-785 number when it's obviously wrong. If anyone has a cast iron TSX-765 in rebuildable condition, please let me know. This site didn't have a rebuilt unit in stock due to a lack of rebuildable cores.

een many old Ford M/S numbers and for 601 series tractors, all I have ever seen are 692 and 765. Never seen 785 anywhere. If throttle bore same and bolt spacing same, it will likely work.

 

[Arroyo]

Still working trying to sort out my carb problem. Rebuilt the carb using one of the Walker kits which was easy but I have a question for anyone with knowledge of these carbs. Do all of the MS carbs have a power jet below the nozzle? According to the diagram there should be a jet, but there is no jet present. I'm wondering if someone has lost it during a previous rebuild. I've looked at a lot of the complete rebuild kits for the TSX-765 carb online and they don't seem to include a jet other than the idle jet. Does anybody know anything about this?