Posted by big a on September 14, 2011 at 19:15:51 from (166.181.2.36):
Been working on this for a week or better with no luck. Tractor was sitting for 10 years or so, and I have no idea how it ran before. Soaked carb for a week, blew everything out and replaced needle.and seat. Idle jet appeared to have been drilled, so replaced it too. Float is set to factory specs, and not leaking.
The engine is running rich at idle, but normally once off idle. Smokes black at idle and idles rough. I noticed at the initial tear down that the idle needle was completgely closed. Seems to run best with it closed....but even better with the idle screw removed completely. You can feel slight vacuum with your finger over the opening, and when covered, it runs richer.
Heat riser is working, new plugs and been through the distributor. I suspected damage to the the idle needle seat, so marked the needle with a marker and screwed it in....leaves a nice even mark on the needle.
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