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Harry Ferguson Tractors Discussion Forum
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TO-30 Zenith Carburator Settings

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dfitch

05-11-2007 06:08:16




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Does anyone have the initial setting for a Zenith carburator on a TO-30. I think it is a ABC223. It was sold as a direct replacement for the TSX458. The problem I am having is a very loud backfire after the engine has completely stopped. Sounds just like the car John Candy drives in the movie Uncle Buck.




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CENTAUR

05-11-2007 10:39:31




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 Re: TO-30 Zenith Carburator Settings in reply to dfitch, 05-11-2007 06:08:16  
Did you adjust the throttle stop screw for a slow idle RPM? Then adjust the idle mixture screw for smoothness.If it has a high speed adjustment Adjust it in & out(lean & rich) till you get the max RPM.You have too much fuel still getting into the engine while something is still hot enough to ignite it.So you have too high idle RPM or TOO HOT spark plugs or red hot valves etc.which can ignite the unburned fuel. Remember the engine is still a vacuum pump sucking. My guess would be simply the idle. CENTAUR

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