Posted by t-bird88 on November 01, 2009 at 11:32:05 from (76.242.188.124):
Now if Kay had fuel injection I could fix this in a minute, but carbs are a strange beast with me that I can never get set right. I have rebuilt this carb once last fall (so don't ask me about particulates about the carb, I really don't remember) and cleaned a lot of rust out of the fuel bowl area and changed out the jets. This is a TSX 241 B carb if that helps any, to me they all look the same. So here is the deal:
New motor starts right up, full throttle 1800 RPM and "POPS" through the exhaust. The needle on my tach kind of jumps around a little bit. The kicker is if I pull out and hold on the choke just a bit that the motor smooths out and increases the RPM up to 1900. If I turn the idle adjusting needle any where from the seated position the tractor starts popping and running rough. If I pull out on the the choke a little bit more it smooths out. It really does not matter where the power adjusting needle is set at because the further out it is turned the worse that it runs with the exception of being seated, where it dies.
It also will not idle below 1100 RPM without popping through the exhaust and dieing. Once it gets to about 1150 I can turn the idle adjusting needle out and it smooths out just a bit, but it still will not idle down, even when I change the setting on the idle speed adjustment screw.
I do know that if the choke has to be pulled out there is not enough fuel getting to the jets, but even with a fuel pump hooked up to the fuel line (I know that the 2N's were gravity feed, just trying to figure out where the restriction is) I still have to have the choke pulled back and held just about 1/3 to 1/2 way closed. And as far as I know, all of the holes/orifices/passages/screens are clear. What have I missed?
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