High RPM at start on H

I have restored a 1947 w/regulator 6 Volt H. I did nothing to the engine, govenor, carb or manifold because it was running faily good prior to teardown. I cleaned carb by putting entire carb in carb cleaner. I also replaced all plugs, plug wires, points and wiring. I now try and start and it starts O.K. but at a high RPM and I can"t throttle down at all. I have rechecked the govenor connection where the keyed shaft goes into the carb to fit with the mating part that controls the manitfold butterfly and It"s O.K. I haven"t done any adjusting to carb because it was O.K. before teardown, but the sediment bowl was very dirty and I beleive that the carb had to be sucking fowl gas. It now is all clean but start"s off at high RPM. I am going to check the throttle linkage yet because that"s the only other thing I had diassembled but I think it"s also O.K. Any ideas why??

Thanks

(quoted from post at 12:24:40 12/05/11) I have restored a 1947 w/regulator 6 Volt H. I did nothing to the engine, govenor, carb or manifold because it was running faily good prior to teardown. I cleaned carb by putting entire carb in carb cleaner. I also replaced all plugs, plug wires, points and wiring. I now try and start and it starts O.K. but at a high RPM and I can"t throttle down at all. I have rechecked the govenor connection where the keyed shaft goes into the carb to fit with the mating part that controls the manitfold butterfly and It"s O.K. I haven"t done any adjusting to carb because it was O.K. before teardown, but the sediment bowl was very dirty and I beleive that the carb had to be sucking fowl gas. It now is all clean but start"s off at high RPM. I am going to check the throttle linkage yet because that"s the only other thing I had diassembled but I think it"s also O.K. Any ideas why??

Thanks

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Check that governor connection again!! One other possibility, did you have the throttle plate out of the carb? Did you get it back in correctly?

I agree with Rusty. It's easy to mis-assemble the carb connection and miss the slot in the throttle shaft. Soaking an assembled carb in cleaner won't clean much of anything except the exterior and that doesn't affect function at all. To properly clean an old cast iron carb it must be completely dis-assembled and all the passages cleaned mechanically. Carb cleaner alone won't do it.

I did check the govenor connection when I had the carb assembled to the govenor but not yet completely assembled to the manifold. I reached over and moved the govenor arm coming from the throttle to simulate throttle advance and watched the buterfly in the top of the carb which is conected to the linkage to the govenor. The butterfly moved as I moved the govenor arm, so that told me that I had that linkage connected. Unless there's a way to get it wrong or not connected all the way it looks like that connection is good. I didn't pay attention how much it moved so if nothing else I can disassemble again and watch how much movement I get. Butterfly should go from open to close I would imagine?
I didn't have the carb apart at all. I just dismounted it from the manifold, govenor and the air cleaner and soaked it in carb cleaner. I think I would have had to disassemble the carb to get the throttle plate wrong or am I thinking of something else????

Thanks Rusty

When you moved the throttle to the idle position with the engine stopped, did the throttle plate move to the closed position. If not, the linkage isn't connected right. Just a thought, hope you figure it out.

if all your connections from governor to carb are correct, when you installed the carb, did you replace the gasket between manifold and carb? or do you have the carb nuts snugged up good? Sounds as though you might have an air leak somewhere...Just a suggestion

As I replied to Rusty I did take the connection at the carb to govenor apart again and back together and this time I assembled the govenor to the carb but not completely to the manifold. This allowed me to be able to see the butterfly at the top of the carb going to the manifold. I then reached over and moved the govenor arm simulating throttle advance and watched hte butterfly. It moved so I assummed I had the govenor throttle shaft connected correctly. I didn't however pay attention as to how much it moved. I'm assuming that it should go from completely closed to completely open. I probably will have to disassemble again and pay attention that I get full movement on that butterfly to assure that the govenro throttle shaft is engaged into the carb completely and correctly. Do you know if that butterfly should move that much without the engine running and the govenor going around??
Thanks Paul

When you refer to the throttle plate, is that the butterfly in the top of the carb going to the manifold??

If you took the carb apart, check the air horn, they can be put in upside down and they will run wide open(don t ask)

thats what i suspected u did was just throw it in a pail of carb cleaner.then you are saying you didnt do any adjusting before teardown cause it was good. very confusing post. carb has to be completely disassembled prior to soaking. then washed with cool water and all passages blown out with air.usually dont remove throttle plates unless bushings or shaft is worn and need repair. i believe you have the governor tab not in line also.better do the carb job correctly now cause it will still have all the carbon and dirt in it, and run worst than before!

(quoted from post at 16:39:02 12/05/11) As I replied to Rusty I did take the connection at the carb to govenor apart again and back together and this time I assembled the govenor to the carb but not completely to the manifold. This allowed me to be able to see the butterfly at the top of the carb going to the manifold. I then reached over and moved the govenor arm simulating throttle advance and watched hte butterfly. It moved so I assummed I had the govenor throttle shaft connected correctly. I didn't however pay attention as to how much it moved. I'm assuming that it should go from completely closed to completely open. I probably will have to disassemble again and pay attention that I get full movement on that butterfly to assure that the govenro throttle shaft is engaged into the carb completely and correctly. Do you know if that butterfly should move that much without the engine running and the govenor going around??
Thanks Paul

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That governor tab can easily end up right in the slot where it should be, or just above the slot, or just below the slot. Moving the throttle linkage with the tab in either of those 3 places WILL cause the throttle plate to open or close, but if that governor tab actually ended up BELOW the slot, the carburetor is then free to go wide open when you start the engine.

(quoted from post at 16:42:14 12/05/11) When you refer to the throttle plate, is that the butterfly in the top of the carb going to the manifold??

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Yes, exactly. I don't know why it ever came to be known as a "butterfly".

I made that mistake with my Farmall H. Had the carburettor rebuilt, fitted it and the motor started easily and ran at nearly full speed. The shaft was holding the butterfly open. At least it was an easy fix, though my brother, who was with me when I first assembled it told me that I should have checked it the first time… and that from a computer scientist!
SadFarmall