Posted by Don-Wi on August 27, 2016 at 22:29:03 from (75.207.58.99):
Thought I'd try here, as a few other guys have been working on their small engines lately it seems. I picked up an early ('68) JD 140 garden tractor this spring. I've worked a few bugs out, and it runs ok, but at high idle it stumbles until I bring the throttle back down to about 1/2. When I got it, it didn't seem to run right at all. I rebuilt the carb, and installed new points and a condenser. I also put new rubber fuel line and a new fuel filter on it. I didn't think it ran fast enough, so after getting a photo tach to check it with, it was only running around 2400 RPM instead of the 3600 or so that the book calls for.
It's a Kohler 301 12 HP engine (serial is 3395)
I got it to get at least close to 3600 now after putting a heli-coil in the hole that holds the throttle cable clamp and putting the throttle cable in what I assume is the proper hole on the linkage, given the wear on that hole and not the one it was in.
The main problem I'm having now, is that it stumbles like it just isn't getting enough gas at full throttle, but using the choke makes it worse. I can get it there if I slowly increase speed, but as soon as I try to move it or engage the deck it starts to stumble again. Seems to get a little better as it runs and gets warmer.
Where should I go next? Sick of cutting with a Crapsman... and I miss having the luxury of my parents 425 w/ 60" deck.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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