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Farmall & IHC Tractors Discussion Forum
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Farmall B backfire

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Harry37

05-29-2005 19:33:03




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I have a farmall b with a backfire pop through the exhaust. Held a piece of cloth over exhaust and when it pops does not pull the cloth toward exhaust. Seems best with mag adjust all the way towards engine. Acts like is not getting fuel. Has new Zenith carb. Blew air back through line towards sediment bowl and seemed to help now bad again. Got dirt in bottom of bowl after blowing through line. Timed mag initially according to specs. Is there gears inside the mag that should be in time too? This is a new mag I bought. Thanks

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captaink

06-01-2005 08:18:16




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 Re: Farmall B backfire in reply to Harry37, 05-29-2005 19:33:03  
If your engine runs and the firing order is correct and you have intermittent backfiring, it could be caused by a lean fuel condition. You alluded to the fact that you had blown back into the gas tank and this had helped but now you have dirt in the bottom of the sediment bowl and it is worse. I would check to make sure that you have good fuel flow to the carburetor for a sustained period (at least a minute) to eliminate this a potential problem.

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El Toro

05-30-2005 06:16:44




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 Re: Farmall B backfire in reply to Harry37, 05-29-2005 19:33:03  
Are you sure you haven't cross wired the plug wires? Find No1 and going CW your next plug wire should be on No3, then 4 and 2. If these are ok, check that valve clearance. Hal



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Robert in NC

05-30-2005 14:18:46




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 Re: Farmall B backfire in reply to El Toro, 05-30-2005 06:16:44  
Check your plug wires and points gap. It sounds like you have it wired 180 degrees off.



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