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Tuning an A

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BillWV

08-12-2003 04:47:42

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YTers,

I need help tuning a miss out of a Farmall A. I never was a great mechanic, just a parts changer, and I've forgotten anything I ever knew about conventional ignition and fuel systems. The A has a subtle miss at any throttle setting unless it is under load. In a pull, it sounds good. I replaced the cap, rotor and plug wires in the course of the restoration; took the carb apart and set the float level and cleaned it up. Fiddled with the timing. Nothing has helped. Any suggestions before I start throwing parts at it?
Thanks,
Bill

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Tim

08-12-2003 16:52:12

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Re: Tuning an A in reply to BillWV, 08-12-2003 04:47:42

You might have to check all the valves.I took mine to a machine shop and he replaced all the valves and seats because of years of running unleaded gas.

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BIG JOHN

08-12-2003 14:32:19

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Re: Tuning an A in reply to BillWV, 08-12-2003 04:47:42

BILL - I had the same problem with my IA and went thru everything even changed the carb and the dist.

Finally checked the valves and found that I had one valve that was not adjusted quite right and it was not closing completely.

Hope this helps

GOOD LUCK

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Dave_Id

08-12-2003 07:40:17

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Re: Tuning an A in reply to BillWV, 08-12-2003 04:47:42

..also check your new rotor, I replaced one where I got buildup on new rotor and one of the electodes on the new cap, caused a miss

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Fred

08-12-2003 06:17:21

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Re: Tuning an A in reply to BillWV, 08-12-2003 04:47:42

You did not mention anything about replacing the points or the spark plugs. Both can cause fits if acting up. They are a cheap fix to finish your tune up. Fred.

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n.t.

08-17-2003 16:58:50

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Re: Re: Tuning an A in reply to Fred, 08-12-2003 06:17:21

check the point gap on all the distributer lobes. you may have one lobe of the dist.worn when the other three are in good shape.

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