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Farmall & IHC Tractors Discussion Forum
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300U Missing at Low Idle

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Mfan

05-06-2012 19:32:37




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300 utility, still 6 volt positive ground. New points and plugs, timing set. Runs well at high rpm, good power. When dropping back to low idle, will miss but not in a regular pattern. Idle is set around 500-550 rpm, will stay at that and not die off. Any suggestions?




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david G

05-07-2012 13:51:36




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 Re: 300U Missing at Low Idle in reply to Mfan, 05-06-2012 19:32:37  
I would check the valve clearance, could have one wide.



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Janicholson

05-06-2012 20:25:59




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 Re: 300U Missing at Low Idle in reply to Mfan, 05-06-2012 19:32:37  
If it just pops and flips the rain cap every few seconds it is pretty normal. I would adjust the idle mix and timing to spec, and if it is inconsistent, and as described, leave it alone. Jim



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504

05-06-2012 19:58:49




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 Re: 300U Missing at Low Idle in reply to Mfan, 05-06-2012 19:32:37  
Idle circuit in the carb is plugged. Try Seafoam first before tearing into the carb.



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