Lark wont idle right or run. Help..

Gwedo68

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I have a 1958 evinrude lark started idleing really high and either dies out or dies when I go to put it in reverse or forward. Used to idle ok. Thinking something wrong in the carb?? Maybe fuel pump?? Where should I start? :confused:
 

Daviet

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Re: Lark wont idle right or run. Help..

Start with the basics, compression, spark and then fuel delivery.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

Thank you.. Was going to do compression test and replce plugs first. Dont really know how to cheak fuel pump?
 

Daviet

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Re: Lark wont idle right or run. Help..

You can disconnect the line that goes to the carb, spin it over and see if the pump pumps fuel. If you pump the primer bulb while the engine is running it will bypass the pump.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

Ok thanks. Will try those three things first. Is it normal than if you pump the bulb too much fuel comes out of front of carb a bit?
 

Daviet

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Re: Lark wont idle right or run. Help..

No, not if the needle/seat in the carb is working properly. Could also have a float problem.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

Would a float problem make it idle so high then die out?
 

Daviet

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Re: Lark wont idle right or run. Help..

If the float was sinking in the carb bowl, it would flood the engine and cause it to stall at low speeds.
 

Daviet

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Re: Lark wont idle right or run. Help..

You're welcome, let us know what the results are.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

I will. Sure I will have more questions.. Thanks again.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

Havent had much time but did pull spark plugs out. Both jc4 the top one ok the botoom one has a shim on it hole is bigger..
 

Gwedo68

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Re: Lark wont idle right or run. Help..

Ok, spark plugs do need replaced, but fuel pump is pumping.. Bad news is only about 40 on the compression on each. Is there anything i can do to make compression better? Or does it need worked on?
 

lindy46

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Nov 27, 2008
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Re: Lark wont idle right or run. Help..

40psi is way too low for that motor. My 1957 Lark runs 120psi on both cylinders. Maybe a blown head gasket? As long as one cylinder has stripped out, I'd look for a replacement head.
 

Gwedo68

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Re: Lark wont idle right or run. Help..

was afraid of that. One hole has been resized. Im looking into how much it can be fixed for.. Sounds expensive. I know parts are out there, but I dont know much about small motors. Thanks for advice..
 
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