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86 Evinrude 40hp won’t idle

R

Rlewandowski86

New member
Hey guys, new here and looking for some help. I just bought a 1986 Evinrude 40hp tiller with electric start. The guy said it had been sitting for a while but ran when he put it away last. (Famous last words) I got it to pop over so I bought it. Got it home, my dad took the carbs off and cleaned them, they were filthy. Put them back together and it will run if I press the choke button constantly(not sure what the little electric choke thing is called on the handl.) I keep pressing it and it will run. It will rev up nice but even if I try to hold a higher rpm, it wants to die. Give it a little more throttle and it will rev up and stay then try to die. It’s more of a won’t stay running problem then a lack of idle. Took apart and cleaned the fuel pump. Not a VRO. New fuel, new tank, new line. Primer ball stays firm. The only issue was when cleaning the carb, the jet in the bottom of the bowl, a fixed jet, would not come out and stripped the brass a little on the head. The small part of it is still fine, blew it through and it’s clear so doubt that has anything to do with it. Any advice would be great. Also, what is the proper way to use the little choke button. Hold it or press it a few times? Thanks.

Rick
 
Clean the carbs again preferably soak them in a good cleaner. The choke on that is actually a primer it puts fuel into the motor bypassing the carbs. The only time the primer works is with the motor turning. So no need to press it a few times just push the key and start.
 
The high speed jet ID is a specific size. The slightest degree of fouling, gumming, gunk, clogging that jet of which fuel must freely pass thru before it gains passage to any other fuel passage will result in the explanation you state.

Tell your dad to carefully clean those high speed jets in the float bowls with a blunt faced piece of single strand wire as solvent doesn't do that job properly.

It takes a special tool as shown below to remove those jets, available on this site I'm sure.
317002_CARB-JET_REM-INST.JPG
Ignore my price- Long gone.
 
Thanks for the help guys. Compression 140 on each cylinder. Did a full rebuild on both carbs and the fuel pump and replaced most fuel lines. Found the tube that goes from the carb into the bowl was still plugged. Runs like a champ now!!
 
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