Posted by chadd on October 21, 2009 at 10:28:01 from (69.129.91.234):
In Reply to: 574 runs lean posted by A.D. on October 20, 2009 at 16:32:59:
I am not trying to sound smart here, but did you put the venturi back in when you reassembled it? The symptoms you list are exactly the same as making this mistake (don't ask how I know. . .) The symptoms are also, as John mentioned, identical to that of a major vacuum leak. Did you spray test around the carb to manifold mating surface? On a side note though, these tractors do seem to run pretty lean. I find that when it is pulling any sort of load, it requires up to 1/4 choke to get power. Ours has the replacement shut-off solenoid without a main fuel adjust, so the size of the main jet dictates fuel flow. The 544 uses the same engine with a different main jet. I have asked several dealer mechanics and parts guys the difference but none of them know. It could be larger, but I was never brave enough to spend the money to find out...
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