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  1. D

    8hp Evinrude running poorly.

    I haven't torn the engine completely down to inspect, but here's what I was able to see through the exhaust ports and borescope through the ports to the cylinder walls.
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    8hp Evinrude running poorly.

    Makes me wonder if maybe someone threw a different carb on there, like from a 9.9 or something. If that was the case, could it be fueling too much? The only number I have from the two carbs I have are the numbers stamped on the bodies of the carbs: The one that came with the engine is...
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    8hp Evinrude running poorly.

    What is strange about this whole thing is that from looking at the passages in the carb body, the top cover, etc., it leads me to believe that even if a well was used with too large of a idle passage, the idle fuel mixture delivered behind the throttle butterfly is 100% controlled by the idle...
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    8hp Evinrude running poorly.

    Here's some video of it running on the lake. First part of the video the idle circuit was still working. The carb was using the nozzle well with #4 molded in the bottom, this was NOT the nozzle the carb on the motor came with, I got this one with the other carb I bought off eBay. Second part...
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    8hp Evinrude running poorly.

    Makes sense, hopefully the two that I have are the wrong one and the one coming is right. No part numbers on either of the ones I have other than the "2" and "4" molded in the bottom. I wonder what else in the carb, possibly incorrect parts, would explain fuel delivery issues making it run so...
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    8hp Evinrude running poorly.

    Took carb apart cleaned it up, put it back together with all the original parts, fixed whatever was causing the idling issues. Think it might have been the new line that runs from the nozzle well to the idle orifice had a pinhole or something. Put the old one on idles fine now. Ordered a OEM...
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    8hp Evinrude running poorly.

    Yep, got one on bottom and a ring on top that seal it to the aluminum body.
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    8hp Evinrude running poorly.

    Interesting... I have a 2 and a 4. Wonder if the 3 is in between or if there's no correlation.
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    8hp Evinrude running poorly.

    Good to know, lol. So here's where I'm at now: Out on the lake, at first it started right up and idled well, would run fine through the lower-mid rpms, and then start 4-stroking as soon as it got into the higher-mid RPM range, and couldn't build up enough RPM to get up on plane it was...
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    8hp Evinrude running poorly.

    Uhh on top of the powerhead? These only have one adjustment that is on the plastic cover on top of the carb . Am I missing something?
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    8hp Evinrude running poorly.

    Update from the lake. Still running rich. Been playing with the carb a bunch. Finally took the silencer off and found it runs a ton better with air getting rammed into the carb once you get moving. Got some video. Will upload when I get back. I really wish I had a known good carb specific...
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    8hp Evinrude running poorly.

    Its running.... 100% better. Holy crap, that might have been it. Someone replaced the well with one from a different carb that had a bigger idle restriction tube in it. I never tried running the well from the eBay carb, I always just used the one that the carb the engine came with had in it...
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    8hp Evinrude running poorly.

    Interesting development!! I was comparing carbs again. Looked at the fuel well. Carb that came with the motor has a much larger idle restriction/jet/whatever you want to call it in the plastic well than the old carb. Both are #50 for the main jet, but the little brass tube that connects to...
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    8hp Evinrude running poorly.

    After what I've seen today I'm now with you 100% that the issue lies with the carb. See if you can explain this to me: Rebuild the carb with the good Sierra gasket kit that took 2 weeks to get here. New needle and seat, set float height, replaced all gaskets, new rubber tube to idle circuit...
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    8hp Evinrude running poorly.

    Wish the market here was that good! I'd have just bought another lol
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    8hp Evinrude running poorly.

    LOL well other than a lot of my time I can't say I've spent a bunch of money on this thing for unnecessary parts, though jury is still out on whether the eBay carb was worth it or if its just as junk as the first one. If nothing else got the plastic cover from it which is in great shape...
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    8hp Evinrude running poorly.

    I apparently missed this in one of your posts ct1762 - Will the threadlocker hold up against the fuel, or is this just a temp fix to test? Also, any particular, blue, red?
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    8hp Evinrude running poorly.

    I'm back at it again after getting the powerhead seal kit. I removed the old lower crank seal and installed the new one. I also installed the new gaskets for the side covers over the exhaust ports. I didn't replace any of the other gaskets as they were in decent enough shape to throw back on...
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    8hp Evinrude running poorly.

    Ok, so I made some temporary gaskets which (mostly) sealed things up at the exhaust cover, ran fuel line straight from tank to the carb, ran it lightly squeezing the primer to keep the bowl full. Still didn't run right. So I don't think the fuel pump is to blame. It'll be replaced regardless...
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    8hp Evinrude running poorly.

    Thanks, I think I understand what you're talking about. What information does spraying fuel into the carb when it starts running rough provide me? If it smooths out, I assume its an issue with the engine not getting enough fuel. But it won't help me diagnose if the engine is getting too much...
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