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MF65 gas (continental)...diesels after shut off.

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Hay hay hay

04-19-2017 15:12:25

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It just started recently. Happens after the engine is fully warm (hot) operating temp.
Runs on for 5 to 10 seconds after the key is turned off.
What causes it? Will it lead to a larger problem? How do I fix it?

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joe ferguson

04-20-2017 08:36:40

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 Re: MF65 gas (continental)...diesels after shut off. in reply to Hay hay hay, 04-19-2017 15:12:25  
Caused by accumulated carbon under the head and/or plugs becoming red hot and ignites the the gas mixture
when the ignition switch is off. carbon may be caused by burning some oil from worn rings...
dirty carburetor or adjusted too rich...poor gas...old gas.

If tractor is used only few hours per year I suggest premium gas and gas stabilizer Stabil or others.


Joe Ferguson

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04-19-2017 22:11:36

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 Re: MF65 gas (continental)...diesels after shut off. in reply to Hay hay hay, 04-19-2017 15:12:25  
If the static timing is advanced too far it will be harder to start, and it will diesel. If it always starts easy, and the idle is a little too high, or if the idle mixture is a little rich (some black smoke out the exhaust when idling) it will diesel.

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04-19-2017 20:02:10

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 Re: MF65 gas (continental)...diesels after shut off. in reply to Hay hay hay, 04-19-2017 15:12:25  
Timing could possibly cause it, to much advance.

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Gary from Iowa

04-19-2017 17:08:40

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 Re: MF65 gas (continental)...diesels after shut off. in reply to Hay hay hay, 04-19-2017 15:12:25  
Without more information, sounds like it has the idle set to high. Is it running rich, black smoke? If so, lean the carb down a little.

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Hay hay hay

04-19-2017 18:25:47

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 Re: MF65 gas (continental)...diesels after shut off. in reply to Gary from Iowa, 04-19-2017 17:08:40  
if I had more information, I would not be asking.

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