Missing H

My name is Ben and I am a big fan of IH. So big, that I have a 44 H in my garage as well as a 130. I bought the H cheap at a sale a few years back and have been slowly working at it when I have free time. It was a rough runner when I bought it; so rough that it was only running on two cylinders.

I have been able to get it to run on all four now, and I had the head redone. So now my problem is that it starts up right away but there is a distinctive miss to it.

This is what I have done so far to address the problem. I have adjusted the timing-no difference in performance. I have checked the valve spacing, everything matches factory specifications. I have adjusted the carburator that I had rebuilt when the head was being done.

I played around with everything and there is still a distinctive miss to it, especially when it is under load. I took it for a ride, and when I got up to speed it was cutting out horribly. I look forward to your suggestions, as I just stood there for about 20 minutes yesterday staring at the engine trying to figure it out. That's when I decided to get some expert advice.

Thanks for helping me out in advance I appreciate it very much.

Ben

Thanks for getting back to me, and thanks to everyone else who responded. I should have clarified that it is a distrubtor ignition system on the particular H. Charlie, the choke makes no difference, I played around with it to see if that was a problem, but there was nothing.

The only thing that I did not consider was the possibility for a ballast resistor. I did change the tractor to 12 volt and I purchased a new 12 volt coil, as the old 6 volt gave up the ghost. So I went a purchased one from my local CaseIH dealer. I asked on three seperate occasions whether or not I required a ballast resistor for this particular coil and they said no. So, I went with that. However, maybe I should get one.

Perhaps I should get one to see if that will make the difference. As far a startin goes, the thing sparks right up, so I know the points are in good shape. The plugs and wires are all new, in fact I even exchanged the new plug wires with the ones on the 130 and there was no difference in performance.

I watch the valves, and they all seem to opening and closing the way they should.

However, I will look into all of these matters and hopefully I can figure out the problem.

Thanks again,

Ben

The missing is there constently, at a low idle it is in bad, but when I get the throttle up there it is pretty bad, when I get it under load it is even worse, to the point that it cuts out.

If changing the timing at full throttle does not help, then I am thinking a manifold leak.

I can't add a thing to what "J" and "Bama" have advised, except check the fuel for water or contaminates?

"TU"

After that, I would suspect something is out of spec in the head. It sounds like you adjusted the valve lash and know what you are doing. For some reason, I suspect a sticking or stuck valve. If you have a rythmic popping out of the muffler then suspect an exhaust valve.

Again...hard to tell..and I haven't worked on any magneto equipped tractors as mine have all been post 1948 models.

Best of luck...BB

J in Pa