Posted by PurdueAg on October 18, 2011 at 17:40:50 from (198.109.220.6):
Hi All,
I posted a couple weeks ago with problems my dad (retired) and I are having getting a 1950 H with magneto running properly. Thought it was timing, but we timed the pinion gear to the rotor gear, and timed the magneto gear to the cam gear so that the impulse coupling snaps at TDC on the compression stroke. Wires set for 1-3-4-2 firing order. Carb has been rebuilt by a "professional". Even took it back to him when we had problems starting and running tractor (see below) and told him to check it again. He said it was fine.
I don't think it is the timing, because it will start and run fine for 10 - 15 seconds then "sputter" once or twice (but not die), then run fine, then sputter once or twice (at about 10 second intervals). No back fires or anything, just sputters a little bit every 10 seconds or so. In between "sputters" it sounds perfect. It will run like this as long as you let it with throttle above idle. My thought is that there must be plenty of revolutions in those intervals such that if the timing was off, you couldn't have it run so well for even short periods.
We have to pull the choke for just a second when starting to get it to fire, then we have to keep the choke on just a *hair* (hardly at all) to keep it running. I never have to choke my own H, even when it is cold, but I know that varies between tractors.
Tractor will not stay running when throttle is set to idle. We have to keep it at 1/4 to half throttle to keep it running.
If you turn off the engine and try to restart, it won't, and the carb floods. We have to wait til it sits a long while (usu. overnight) before we can get it to start again.
Questions:
This just sounds like a carb problem to me, but
1) Could it still be a timing problem? 2) if it's the carb, what do we do / check - we have already set the idle and jet screws to IH manual specifications and even played with them while running with no success. And presumably the carb has been "re-built". 3) Even though the magneto was rebuilt with new coil and condensor and points (and presumably re-charged magnet), could a faulty coil or condensor cause these symptoms? 4) Would the governor have anything to do with the symptoms we are experiencing?
I'm at a loss. I've never had this kind of difficulty with an old farmall before (but I have never had one with a mag, either).
Any thoughts would be GREATLY appreciated. Thanks!
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