Johnson 3.5 running a bit groggy - SailNet Community

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  • 1 Post By dabnis
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Old 08-25-2012
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Johnson 3.5 running a bit groggy

Hello Just picked up a 2004 Johnson 3.5 2 stroke outboard Model J3RSRE . on running it in my test tank its seams a bit groggy, also in gear at a set throttle it seams to rev up and down slightly ? don't know how long the fuel has being laying in it though.
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Old 08-25-2012
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Re: Johnson 3.5 running a bit groggy

Lots of possibilities, suggest you start with the easy things first:

1. Replace the fuel with fresh and add the recommended dose of fuel additive, I have used Berrymasn's B-12 Fuel additive for many years with no fuel related problems.

2. Treat it to a new set of properly gapped plugs

3. Check all the electrical connections for corrosion or looseness, and all the fuel fittings for possible air leaks, including the carb / manifold fittings for tightness

4. Try setting the low speed mixture while running, turn counter clockwise until the engine starts to stumble, then back clockwise just until it smooths out, no more. Or you could just turn it in all the way then back out about 1-1/2 turns and start from there.

5. Assuming it is timed properly and it has been sitting for a while there may likely be debris in the carburetor. As a last resort, remove and thoroughly clean all the parts, blow out the passages with carb cleaner spray, then with compressed air.

6. You can probably download a shop manual on a Google, or equivelent, search.

Let us know what you find.

Forgot this, check all the fuel filters, including the one behind the fuel pump, if it has one.

Paul T

Last edited by dabnis; 08-25-2012 at 07:43 PM.
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Old 08-26-2012
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Re: Johnson 3.5 running a bit groggy

Hi thanks for that, as a last resort I will remove and clean carb, Ill try new fuel and plug first. Oh can you please tell the recommend plug I should use ??, I will let you now how it goes but it will be a couple of weeks as I need to get my bin emptied test tank and need to other things oil etc.
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Old 08-26-2012
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Re: Johnson 3.5 running a bit groggy

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Originally Posted by corsur View Post
Hi thanks for that, as a last resort I will remove and clean carb, Ill try new fuel and plug first. Oh can you please tell the recommend plug I should use ??, I will let you now how it goes but it will be a couple of weeks as I need to get my bin emptied test tank and need to other things oil etc.
Right, do the easy things first. Don't know what plug it uses or the gap. Here is a site that might help:

1973 1990 Johnson Evinrude 2 to 40 HP Service Manual Repair - Download Manuals & Technical

For $5 it looks good. Another site:

Johnson Outboard 2002-2007 Service & Repair Manuals - iboats

Paul T
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Old 08-26-2012
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Re: Johnson 3.5 running a bit groggy

Like other posters have said, get fresh gas. Empty all the old and replace it with fresh regular gas mixed 50:1 with a TCW3 2 stroke oil. No additives should be necessary under regular use, but some carburetor cleaner might be added for the first half tank or so. I would not take the carb off under any circumstance. I have rarely seen one get better after being "rebuilt", and I know what I am doing. Just try the carb cleaner first, and only if new fuel and a new plug doesn't work. The spark plug for that motor is a Champion L87YC, by the way. Any auto parts store should have it. That was what the motor came with, and I would not try anything else.
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Old 09-01-2012
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Re: Johnson 3.5 running a bit groggy

Thanks guys run this today with fresh fuel and new plug seams to have done the trick.
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Re: Johnson 3.5 running a bit groggy

Good news!
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Old 09-01-2012
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Re: Johnson 3.5 running a bit groggy

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Originally Posted by corsur View Post
Thanks guys run this today with fresh fuel and new plug seams to have done the trick.
Ah, yes, always good to make sure there is fuel in the tank before ripping the engine out of the boat, or car. "Easy things first" is good, something I haven't always practiced however Thanks for the feedback.

Paul T
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