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Originally Posted by rudedawg
Did you find the issue? My 2166 w/ single cyl. Kohler CH16S is doing the same thing. The fuel line from tank to pump has been replaced, fuel filter replaced, carb sediment bowl pulled & cleaned, fuel cap cleaned and spark plug replaced. It runs fine for an hour or so then acts like starving for gas, will run on choke a few minutes then sputters and picks back up when choke pushed back in but eventually goes dead. Cranks right back up runs about 30 minutes then same scenario. Seat kill & reverse cut off switches except brake switch were eliminated years ago. Fuel solenoid seams to work because it doesn't back fire when switching engine off. I don't know what else to do now. 
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Did you remove and clean the fuel tank? Check the outlet at the tank to make sure it's clear?
You guys who have these running issues where the tractor dies after so long have GOT to start figuring out whether you are losing fuel of spark. It's a quick test and MUST be carried out immediately after the machine dies. Figure out which system needs fixing and then we can proceed. You can replace all the parts you want, but until you know whether it is fuel or spark related you are just guessing. A motor only needs 3 things to run: Fuel, air and fire. Most generally air is fine, but I've seen plugged air filters that were so bad engines wouldn't run before.