82 Evinrude 50hp bad idle

[griggsb]

82 Evinrude 50hp runs great all day at top, mid, and low rpm. It just won't idle. Seems to choke out at idle like it's getting too much fuel. Carbs freshly overhauled with new floats, gaskets, needle and seats. Float levels even with carb body. Timing is advancing, and retarding with throttle from stop to stop. Fresh fuel, new tank, hose, fuel pump, and primer bulb. 140psi both cylinders. New wiring harness on motor. Could reeds be bad, but run very stong at full/mid/lower speed? Ran it for 2 hours with no problems (other than it will choke out at idle (after about 1 minute) Thanks for any help.

 

[glassmaster68]

Re: 82 Evinrude 50hp bad idle

if you can put the choke on manually and its stays running in idle,its prob not getting enough fuel through low speed inlet,mine was doing that and it was a slightly mis aligned bowl gasket blocking a breathing port from carb to bowl,ran good except for idle

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Seems to be getting too much fuel. Lower spark plug is wetter than top. New float (adjusted level), and needle and seat. I tested needle/seat wuth carb off. I couldn't blow through the inlet hose at all when float was closed. Everything inside carbs is new, and clean as a whistle.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

Wrong size orifice in the carb? Calls for a for idle # 46 for both carbs.
Did you pull the screw and check the orifice for damage?

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

I have 2 idle jets. idle jet in the side of carb #35, and intermediate idle in the top front #46. I verified on both carbs.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

K, well if the carbs are solid, next spot reeds, any fuel spitting out the carb @ idle?

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Thanks for reply. I wonder if idle jets were switched around. Most old carbs have the slow speed adjustment in top upper area. According to evinrude diagram, where slow speed jet is on older carbs it calls on my 82 a intermediate idle? Does not make sense? Right now #46 jet is in this area. If they got language mixed up on idle, and intermediate idle than that's my problem. Top end was 43mph, and ran great. Jets were in the way they are now when I purchased boat. Kinda makes me wonder.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

According to the site, #35 should be in the middle top, #46 at the back where it bolts up. #35 is the intermidiate idle, if #46 is there then indeed they are switched around.

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Thanks for your help. Ok switched them, and it flooded out. Seemed to be worse. I called marina the other day to ask the correct location, and they had the same info as evinrude parts website. I'm gonna play some more in the morning. I'll try to adjust idle speed, and check that throttle advance (on carb) lines up with the "start". I'll post results. I just don't understand. Carbs came with jets switched (according to evinrude). And local marina rebuilt carbs before I got it. They told me it would have been tested before it left there. I am so discouraged. This runs soooo good (except for idle). I've been working on it since last fall when I got it. Thanks again for any help, or ideas.

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Also in your opinion how can intermediate idle jet be the smaller diameter jet? You would think that idle jet woulod be the smaller? Mabey not though.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

Have you put the spark checker on both cylinders and watch the spark while it's running? I watched the video Brian, it looks like a nice motor- i'm sure you'll get it.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

K i'm confused:

http://forums.iboats.com/showthread.php?t=386693

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Yes, both are firing. Had it at lake today for first time ever and it ran 43mph with me and a friend. Never skipped a beat for over two hours (other than idle)? Didn't notice fuel spit out at idle. I don't see how marina could have put jets in wrong locations? I think the Evinrude diagram has the intermediate idle, and idle ports switched. On every old 'rude i've had low idle speed adjustment is in the top center. On diagram it calls that intermediate on mine? Doesn't make any sense that they would have changed the carb design (and move low idle adjustmnet). Low idle (I thought) always was at the top of the emulsion tube.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

Hang tight, let me do some quick reading, 10 minutes.

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Sure thing.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

My manual says the 50hp's idle orifice is top front, the intermediate is at the back but says it's the 55hp+ carb. Maybe someone knows for sure.

I looked at an 84, says the intermediate is front top, same as the rest. I'm starting to lean towards this setup. Are all the orfices clean on the carbs, maybe some buildup.

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Thanks for that info. My carb # is 325343. Don't know if that makes a difference? The more I think about it, I think the need to be the way diagram says. I think Evinrudes language is wrong on the locations. I think today off idle was a bit funky as well. Ok #45 big jet is in top center (idle port). It's pulling in enough fuel to idle. Then when you step idle up I think it may pull additional fuel (fron #35 small port). Pulling fuel from both at the same time possibly? That's why intermediate idle just needs a small amount (because it also is pulling from bigger jet? Does this theory make sense to you? I'm kinda on the fence about it.

 

[bktheking]

Re: 82 Evinrude 50hp bad idle

Off of one of Faztbullet's posts:

The intermediate jet is almost always a couple size smaller than idle jet. The idle jet is the jet @ 8 oclock and intermediate is @ 11 oclock and main is in bottom bowl. (this isn't on a 50, I'm referencing sizes)

Have you also checked running temp with your laser thermo?

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Have not checked temp. I will next outing. Are you thinking of thermostat being stuck open?

 

[griggsb]

Re: 82 Evinrude 50hp bad idle

Everything in carb is clean. I've had all 3 jets out, and I could see daylight out of them.