Evinrude 6hp idle problem - SailNet Community
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post #1 of 5 Old 06-02-2016 Thread Starter
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Evinrude 6hp idle problem

So my friend has an '68 Evinrude 6hp and the motor is experiencing an idle problem. It starts up, but to maintain idling, he needs to give faster speed setting and to prevent the motor from getting killed off, he needs to come down slow.

Not sure what the issue is, but can it be the idle needle?
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post #2 of 5 Old 06-02-2016
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Re: Evinrude 6hp idle problem

Start with the idle jet needle. Usually set at 1 - 1/2 turns from full 'in'.
Idle jet controls bypass air (to the 'emulation tube' - to control the exact needs of fuel/air ratio) for correct idling.

Water, from phase-separation of ethanolated fuels, usually show up 'first' with idle problems in these old Evinrude/Johnson OBs.
Suggestion: remove the idle and main jet screws ---- exactly count the number of turns and partial turns to remove the needles. Rotate the engine and dump out any fuel (and water) thats inside the carburetor jets and 'air bleeds', then dump the fuel in carburetor bowl. Squirt in some 'rubbing alcohol, into each needle bores / let sit a while / slosh / then dump. Reinstall the needles to the exact 'turns' as for removing, fill with fuel, spritz a small amount of starter fluid into the carb intake, pull the choke, and start the engine (engine's gear case submerged into a LARGE water filled bucket, so you don't destroy the impeller). Then adjust the needles for best obtainable rpm at under 'full load' then at idle, and 'hone in' to the best rpm between between the two adjustment on the two needles.

Evinrude parts: http://shop2.evinrude.com/Index.aspx..._id=0&siteid=1
Need model number and YEAR.
These pages include 'blow-up' / expanded parts diagrams.

Once you get the problem corrected, NEVER use any ethanolated gasoline that is over about 30 days 'old'. Be SURE to add a suitable 'stabilizer' in any 'fresh' gasoline'; but then, store it only containers that tightly SEAL OUT the atmosphere. Then when shutting the engine down, ALWAYS shut off the fuel tank valve and run the engine to completely 'dry'. For longer than 1-2 months OB lay up .... dump the tank; use the fuel in your automobile.

Last edited by RichH; 06-02-2016 at 01:43 PM.
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post #3 of 5 Old 06-04-2016
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Re: Evinrude 6hp idle problem

I'm finding more and more stations selling non-ethanol fuel. Typically in premium grade octane only. If I had problems like this, I would definitely buy a 5 gallon jug of it and haul it to the marina.


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Re: Evinrude 6hp idle problem

what's the issue with ethanol fuel? does it ruin the engine?
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Re: Evinrude 6hp idle problem

Quote:
Originally Posted by fishandships View Post
what's the issue with ethanol fuel? does it ruin the engine?
Yes, ethanol is a solvent that can decay gaskets and other rubber pieces. It is also hydroscopic and will absorb water, from the air, into your fuel. It may also come out of solution, from the gasoline, and become difficult/impossible to burn.

It's been marketed as a renewable fuel source that will help us become energy independent. The problem is, fuel economy (i.e. mpg or hrs/gallon) are reduced by an amount roughly equivalent to the percent added to the fuel. In other words, we don't burn any less gasoline, let alone foreign crude. It's all BS to support agri-business and get farm votes. Even Al Gore, the self proclaimed climate guru, has admitted this.

Yea. Ethanol pisses me off.


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