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Old 03-18-2024, 12:12 PM   #1
dan2255
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Join Date: May 2022
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Default Duromax 420 idle too high when warm

Good day.
I have swapped a Duromax 420 into my golf cart.
I can get the idle set great either when the engine is cold or warm but not both. It will idle with the choke on when cold but will idle to high when the engine is warmed up. Conversely it when the idle it set when warm the cart will not idle when started cold.
I have replaced the stock carb with a carb with an adjustable idle screw and have tried many idle jets. I also have an adjustable main jet but I cannot get a reliable idle speed at different engine temperatures.
If anyone could help that would be appreciated.
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Old 03-18-2024, 06:09 PM   #2
raydhd
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Join Date: Oct 2014
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Default Re: Duromax 420 idle too high when warm

One idea is the low speed idle jet is too lean. Go Vegascarts technical blog and on page 3 is carb tuning 101. Scroll down until you see the instructions for opening up this part.
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