1968 Evinrude 9.5 hp with shut off at full throttle

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yamar6racer

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I think it's the high speed needle that might still be clogged or may have some debri still in there. Engine runs great in idlle and mid range but once you open the throttle it will run for 5-10 sec then want to sht off and will if i don't thottle down. How do i remove the jet that is way in the bottom of the carb? Any tool mod pics so i can see if this will solve my problem? I included some pics of the caborn bild up inside the motor. 111016_001_001.jpg111016_002_001.jpg111016_003_001.jpg111016_004_001.jpg111016_005_001.jpg
 
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MassillonBuckeye

MassillonBuckeye

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

Can you post a pic of the carb and the jet in question?
 
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yamar6racer

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

it's the jet on the botom of the carb where the needle sits behind the 7/16 nut on the drain pan.IMG00007-20111219-1831.jpg
 
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yamar6racer

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

here is a better picture it's the high speed jet of were i am refering to. The jets is located in the back after i remove that nut.111226_001.jpg111226_002.jpg
 
ultra353

ultra353

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

I took a flat bladed screwdriver and filled it down to fit inside the carb cavity. Be carfull though as the jet is made of brass and will break off one of the sides if forced. I had to use a torch ( make sure all gas is gone and carb is away from motor ) and applied some heat several times to get mine to break loose.
 
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yamar6racer

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

ok great ill give that a shot and see how it goes. But if it breaks ill be stuck having to buy a new carb huh?
 
1946Zephyr

1946Zephyr

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

I would test the fuel pump. It sounds like the fuel pump is not keeping up with demand.

You can check the fuel level in the carb, once you charge it up and after it dies at full throttle, then remove the top of the carb and see how much fuel is in there. If it's empty, or close to it, then I would say your fuel pump is not working properly. Try a different tank first to see if the problem persists. If it does, then it's time to replace the fuel pump.
 
jbjennings

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Re: 1968 Evinrude 9.5 hp with shut off at full throttle

I agree with Zephyr. Fuel supply is insufficient, OR, since it is a 9.5hp......... You could have an exhaust leak. I would pump the primer bulb and see if it smooths out and runs. If not then, take the cowl off and see if it runs. If taking the cowl off helps, it's an exhaust leak. If pumping the primer helps, probably fuel pump. It's unlikely that it's the high speed jet if it runs full throttle at all.
Good luck,
JBJ
 
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