Son's 1984 Evinrude 4 hp 2 cylinder fires might run or not

Webekin

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If it starts, it runs high RPM's, most times it fires then dies. Any ideas why it would run fast, and\or not idle. He had a local mechanic work on it but he did not get it running like he would have liked. Open to suggestions, Webekin
 

IslandExplorer

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Oct 21, 2019
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If it starts, it runs high RPM's, most times it fires then dies. Any ideas why it would run fast, and\or not idle. He had a local mechanic work on it but he did not get it running like he would have liked. Open to suggestions, Webekin
Does that year model still have the rich/lean adjustment? Check that to see if it is way out of spec. If you don't know the proper adjustment I'd start at 1.5 turns out from closed and adjust from there. Check tank vent too. My '79 Evinrude 4hp tank vent didn't breathe properly and tank would get pressurized when hot/sun and slowly flood carb. Could make it race erratically. Air leaks around carb can cause weird things too. I'd check the 2 carb nuts and make sure they're good and tight. Just throwin some ideas at ya!
 

racerone

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Dec 28, 2013
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I do not believe that OMC designed 2 HP ever used a fixed jet for high speed.----Pull the flywheel and check the coil, clean points.-----Remove fuel line at the carburetor , open fuel valve and see if there is good flow.----Strainer in the tank might be plugged.----Do a compression test and post the value.
 

racerone

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Darn read them numbers backwards.----Clean the carburetor.------Pull the flywheel and inspect coils.
 

IslandExplorer

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That's a good idea, check those coils! On my 4hp they were pretty crusty because that motor has a pretty open cowl at bottom and can get splashes all the way up to flywheel. I wire brushed and greased mine and saved em just in time. That rust can definitely screw things up!
 

Crosbyman

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1971 4hp ... they all crack unless upgraded ...
 

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Webekin

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Nov 7, 2022
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Son adjusted the carb as instructed and 3 pulls it started and idles much better. Thanks for the info. Webekin
 
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