Posted by oliver1755 on June 06, 2016 at 07:23:56 from (68.21.87.5):
I'm still helping a neighbor get his 1800 running and stay running, and we have narrowed the problem down to the carburetor (fuel). It is set well, runs great, for about 20-30 minutes. At this point, it will die. It is still getting good spark at the plugs, so that is eliminated. Vacuum checks at the manifold are good upon proper adjustment. I'm confident that the carburetor and ignition are set well and it runs like that. Fuel is getting to the lift pump. Fuel is getting from the lift pump to the carburetor. Fuel surges well from the lift pump to the carb.
However, I have no experience with a USX 32. My experience with TSX carbs would be that the needle valve was plugged.
I took the bottom screw under the carb out and get very little fuel out of the carb. I have done no further disassembly.
Can someone help with what is likely the problem with the carburetor and why it will seem to get fuel and run for 20-30 minutes, but then not run for more than a minute or two. The carb was rebuilt in the last 5 years or so at Denny's Carb shop (I advised the prior owner of this tractor to have it rebuilt then.) It didn't solve his similar problems with the tractor, but he didn't really follow up with me after the rebuild and then just sold it. The current owner bought it from the buyer between them.
Hope this makes some sense. Just looking for some ideas before I remove the carb and open it up.
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