Posted by Mrfix71 on April 30, 2013 at 03:41:52 from (96.35.250.161):
Hopefully, this post finds itself in the proper forum area:
This year, my tractor (IH-454 with C-157 engine) will not stay running at high idle or PTO speed. After operating for a few minutes it will randomly lug way down and die but if I am quick, I can shut off the PTO and idle down for a few seconds then slowly bring everything back up. Or, I can idle less than 1000rpm the engine will appear to run just fine indefinately. If the engine dies, I can shut off PTO and close governor control and tractor starts right up.
I originally thought I had bad gas and completely drained the system. Then, I thought it was fuel pump not providing enough fuel, but fuel flow appears to be adequate, even with a small tear in the top gasket/diaphram. While troubleshooting and observing, the governor appeared to be sticking but after complete disassembly, cleaning,checking linkage, and manipulating running governor controls, I am back to something wrong with the zenith model carb. A quick disassemble and cleaning did not reveal anything obvious.
CARB: Ever since I bought the tractor, the choke has always been in the center position and ran fine. I did verify proper operation but thought "If it ain't broke....don't fix it". Yesterday, while making idle ajustments, to my surprise turning the to mix screw did almost nothing.
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