Posted by bc on December 27, 2008 at 11:48:15 from (68.88.175.43):
In Reply to: 656 pops when idling posted by Scott in Illinois on December 27, 2008 at 08:14:48:
I went through that and other issues with my 2606 which had the 1 3/8" throat carb on a C-263. It had the old solonoid with the wire long ago pulled out and the adjustment screw rusted & busted. They put an o-ring on the solonoid and adjusted the jet by screwing the whole solonoid in and out.
Went to buy a new solonoid and all they sell are the non adjustable ones which I didn't care to mess with the wire and also not really needed the shutoff. So I ordered the adjustable screw jet, nut, and packing and installed it so I have some adjustment. Have a fuel shut off on the gas line and I haven't had any trouble with dieseling which is what the shutoff was put on there for.
I don't think you have a carb problem with it running good wide open but I suppose you could take it apart and clean & blow out the idle jet and inner passages. Maybe check the float. If you remove it, may as well soak it in carb cleaner overnight before blowing out all the passages.
Especially before I fixed the carb and even now, I still use a full choke to start it. Mine used to pop and backfire when I pulled it back to idle. Don't really know what fixed it. Put new points and condenser and rotor and cap with no real help. It didn't have the symptons of a bad coil (coil getting hot, quitting after it got hot, etc) but when I changed the coil, all my problems went away and I can't really explain or know why. Later I added new plug wires which made no difference.
Is this something that just started happening on a tractor you've had a long time or is this a new to you tractor? Are you slamming it back to idle like a gas pedal would or are you/what happens if you ease it back to idle? These aren't made to race and gun like a car motor cause of the governor setup.
Let us know what you find out/provide feedback please. I'd like to know.
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