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JD 420S Carb Settings

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Bill

05-05-2002 19:50:48




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I have a 420 that does not idle really well. I adjust the idle screw in all the way in and it still want to idle ruff. What should the idle and load settings be and does it sound like the carb needs a rebuild? Also the manifold where the carb bolts is cold and has condensation on it.

Thanks for the help. Bill




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Clooney

05-06-2002 03:36:36




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 Re: JD 420S Carb Settings in reply to Bill, 05-05-2002 19:50:48  
Bill, I don't have the initial settings for your TSX carb. But they are for just getting it running anyway.
~The idle needle should then be adjusted the for best even idle & the load screw should be adjusted in under load until the engine just starts to miss then slowly out until the miss quits then 1/2 turn out more from there.
~With the information you furnished it is impossible to tell if the carb needs a rebuild.
~Does turning the idle needle all the way in or all the way out effect the idle in any way? ~Does closing the choke help the idle?
~Does the engine run good under load?
~Did this problem just appear or slowly appeared?
~What is the compression on both cylinders?
~Have you tried new spark plugs [that would be a good place to start as the 420 is sensitive to good plugs]
~The manifold being cold & even forming frost is normal, the closed carb throttle plate restricts the air so the air speeds up through the restriction then cools as it enters the low pressure manifold [like letting air out of a tire valve stem]
~With a little more information we can probably be a little more help as your problem could be anything from tight valve adjustment, to bad valve guides, to bad spark plugs, to low compression, to leaking intake manifold, to poor ignition system, to carburetor related, to ?�

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