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'49 SC runs good at idle--awful throttled up--spark advance problem?

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GA. Kern

11-03-2002 18:28:58

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Question for you mechanics out there

My tractor ran better when I first got it than it does now. (A sad commentary after all the elbow grease and the money I've spent Ha!) Everything cleaned up, sludge cleaned out. New coil, cap, points condenser. Valve lash set. Carb cleaned. New gaskets. Manifold repaired Wha's a matter here?

Been "thinkin" on my way home from up North, "puttin up" deer stands. Early on, when "foolin around", I sheared the pin in the larger gear meshing with the one on the distributor by putting in another screw (longer) to hold the condenser in. Trouble is, it was too long and caught on the interior mechanism. That's what sheared the pin. The mechanism seemed okay when I checked it, but I wonder if the mechanism got sprung in there. My tractor runs fine at idle, but when I throttle it up it begins to miss, sputter, backfire and will even kill. Leave it sit for a minute or two, start it up again and it hits on all four again at idle speed.

Anyone had a similar problem? Am I unto something? Is this my next step in my quest to get this machine to run right. Is the mechanism possibly sticking or sprung and not advancing the spark as it should and that's what causing my problem? Appreciate any words of wisdom.

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C. Amick

11-05-2002 09:36:57

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 Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to GA. Kern, 11-03-2002 18:28:58  
Even though you put in a new condenser, I would swap it out and see if that is the problem. I bought new points and condenser for my Case 300 and it ran the same way you described. It took me a long time to figure out the problem.

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GA. Kern

11-05-2002 12:57:05

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 Re: Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to C. Amick, 11-05-2002 09:36:57  
I have another condenser on hand and will do that in my process of elimination.
I just replaced the dist. drive gear. Will try it with the new gear first. If that doesn't solve it (don't really think that's the main problem), then I will replace the wires (they look good, but noted some leakage when I touched them recently. (You'd think that would have been my first order of business). If that doesn't solve it, I will replace the condenser. If all all that fails, I'm calling in a good mechanic--but as a do-it-yourselfer that's hard on the male ego. To top this all off, adding insult to injury, when I was fooling around in the yard trying to get this thing to hit on all fours, at any speed, the starter gave out--the drive mechanism broke for whatever reason. This ol' baby is putting me through all the paces. By profession, I'm a psychologist, and I'm beginning to think this thing has personality (I need a "shrink"). Diagnosis: Oppositional Disorder--late onset in a second childhood (Tractorology 101).

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11-04-2002 09:51:34

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 Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to GA. Kern, 11-03-2002 18:28:58  
When I had that problem of not working under load, I found the rust in the gas tank made a mess of everything. The tractor would quit than a minute later it would be fine, than sputter again, quit... I thought it was the points. Changed the tank, now it runs better than new (very nice).

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11-04-2002 09:36:44

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 Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to GA. Kern, 11-03-2002 18:28:58  
how are the valve springs? I had one that the valves and seats had been ground so many times that the springs didnt close the valves fast enough.(valve float) shimed the springs and it ran like a million. (just a thought)

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Chris Vangel

11-04-2002 05:36:19

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 Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to GA. Kern, 11-03-2002 18:28:58  
It sounds as if you have damaged the breaker plate where the points bolt on. Instead of the timing advancing with RPM's, what is happening is that the dwell is being changed as well, and going right out the window. You could verify this situation easily with a dwell meter by watching what the dwell does as you spool up the engine. It's what I would look at first.

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GA. Kern

11-04-2002 08:53:00

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 Re: Re: '49 SC runs good at idle--awful throttled up--spark advance problem? in reply to Chris Vangel, 11-04-2002 05:36:19  
This is a Delco Remy distributor and the plate you refer where the points attach is fixed with screws to the outside housing. The advance is handled only by that inner mechanism with two little springs and that is free and seems to be moving fine. The distributor drive gear is badly worn and I have another with which to replace it. Possibly that's throwing things out of whack. Will replace it and try again. I do have a dwell meter, but have never used it. Thanks for your comments.

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