Subaru Robin EX17 Problems - Part II

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l008com

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On the last episode of "Subaru Robin EX17 Problems":
http://www.diygokarts.com/vb/showthread.php?t=37529

I could have sworn I had another thread about this but I cannot find it. So I started having trouble where the engine was jammed, I couldn't pull the cord. If I pulled on it and let it slowly move, eventually it would loosen up enough that it would spin. It seems that lots of gas was leaking into the engine. I ended up buying a new carb for it but it was too cold to install so it was sitting on my work bench all winter, until today...

I was able to start it pretty easily today. I let it idle for a bit, no revving at all. It ran for a few minutes then sputtered out. Might have just run out of gas but that was plenty. It wasn't hot but it should have been good and warm anyway.

Drained the oil.... it gushed out for a long time. And it was water-consistency. Clearly it was about as much gas as oil. So I refilled it with a fresh 20oz of some great mobil 1 0w-30. Then I removed the old carb and bolted up the new one. It was a real ***** getting the fuel line on because it doesn't protrude from the engine far enough for you to actually get a grip on it. But otherwise it went well. Except when it was back together, I realized there was no choke lever on this thing. That was weird.

But not as weird as what happened next. I started it up and it revved hard all by itself. Like someone was standing on the gas, but nobody was. I hit the fuel cutoff lever to kill it, but it kept running. It did rev way down to just about idle. Actually it ran like the choke was on when the engine is fully warmed up. After a minute it was still running like this. Then I turned the fuel back on and it revved normally for a minute or two. Then it slowly started creeping up, revving more and more, to the point that it was trying to drive away. I killed it with the red switch before I got run over.

What is going on here? I'm looking at the photo and wondering, do I have to take the choke lever off the old one and put it on the new one? Is that causing this or is it something else?
 

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J.S.@SMS

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A stupid question, and keep in mind I don’t have much experience with Subaru’s. Did you hook up the throttle linkage, because I’m not seeing one. Please excuse me if I’m either blind or an idiot.
 

l008com

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I did. It's not installed in the picture, nothing was installed yet in that photo. The bar to the right is the throttle. I'm sure that linkage wasn't pulling the throttle open. The second time it ran away I put my finger on the piece on top of the carb that the linkage connects to and confirmed it was pushed full to idle, yet the RPMs kept climbing and climbing.
 

Ebrownie

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In that picture, the choke is on. It’s that front plate right there. Not sure if you had it on when it was running, but it shouldn’t be obviously. Did you put the air box or filter on and tighten nuts on the studs so that the carb was tight to the engine? Did you try running your idle stop screw out? It’s the little one that is in the plastic throttle lever on the carb.
 

l008com

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I did have the air filter screwed on tight and the carb itself bolted on tight. If thats the choke than iI guess the lever is not part of the carb, so I guess I should swap the lever over to this new carb. I have no idea if it was open closed or other when the engine was running.

That said, a closed choke wouldn't cause the RPMs to run out of control would it? I did not adjust the idle screw but this wasn't acting like the idle was too high. It starts at normal RPM then slowly increases steadily until it starts to move. I need to play around with it again in daylight.

It seems like there's more going on than just a messed up choke... but I don't know anything about engines so *shrug*
 

l008com

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Ok I was playing with the idle screw a little and there is no middle ground. It either sputters out and dies, or it idles at a way too high RPM. The throttle isn't moving. I can hold it at idle and the engine will still rev very high.

Is this some kind of defective carb? Or might there be something else going on?
 
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