Posted by Will Herring on April 20, 2014 at 10:13:34 from (50.103.225.222):
Backstory: Last fall I was doing some plowing, and the tractor had a few misses, and finally she started to just plain run rough. I had power, but I was worried. So I dropped the plow and shut her down for the night. I go back out to work on her the next day, and try to crank her over, and bang -- the starter bendix breaks. So over winter I got the starter fixed.
Fast forward to today: I just put the starter back on the tractor, charged the battery, cleaned all the connections on the cables, cleaned the carb out (it had some nasty sediment in it, which is part of why it was running rough I think). Fire her back up... Starts okay, idles great, but when you open up the throttle it runs a bit rough still. Not only that, but if you put it in gear, as you start to let out the clutch and it goes under load it stutters a bit as it opens up and takes off.
I'm not sure where to approach working on it next. I don't want to re-clean the carb again (though the float may be bad?) if I don't have to... I'm worried it may have jumped timing when it was missing while I was plowing? Or does that not make any sense? I could go shoot some video of how she operates if that would help, since she does start pretty consistently and stays running. I set the carb to 1 and 1/2 turns out for both the idle and the main jet screw... And no amount of playing with the main jet screw seemed to change much of anything, for whatever reason. The engine just seems to run a bit louder, too, if that makes any sense. All of the oil pressures and fluid levels are where they should be... So I'm at a loss, I guess.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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