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Post by hybridcheef on Aug 31, 2020 3:47:52 GMT -5
was trying to replace all the vacuum lines in my moped because some of them were crap so I got rid of the pair system and some other stuff and I wanted to reduce it to it a minimum one line to the vacuum pump, 1 line for fuel. but after doing that it wouldn't stay idling and I couldn't figure out why it wouldn't so I just put it back to how it was with the t Barb and it works just fine, going back to without a t Barb and it won't stay idle. makes no sense that having the t-barb on with no connector allows it to idle fine LOL. Here's a video of it, I literally can plug the hole and it shuts off, that's what would happen if I didn't have a t there and just had a straight connector. Or if I plugged the end of the t connector. I fixed my moped quite a few times and dealt with troubleshooting quite a few problems but I've never seen anything like this lol. youtu.be/84aSrh1e-hM |
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Post by FrankenMech on Aug 31, 2020 4:32:53 GMT -5
It needs the air to idle. Check your throttle and mixture adjustments.
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Post by hybridcheef on Aug 31, 2020 7:19:50 GMT -5
I'm confused by what do you mean it needs the air to idle? That's when idle screw is for.....The idle mixture is just fine on the carburetor I tuned it earlier. and it already has another outlet on the carburetors top right side that's open so I don't understand why you think it needs air on the petcock line too. This shouldn't be happening so something has to be off whether it's valve clearances or what I don't know but I was just wondering if someone else might know but I appreciate your response it just leaves a lot still unanswered. I've never seen this before on the forums
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Post by FrankenMech on Aug 31, 2020 9:19:37 GMT -5
The additional air from the T connector is required to idle. Shutting it off kills the engine.
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Post by FrankenMech on Aug 31, 2020 11:57:49 GMT -5
Your mixture and throttle adjustments are wrong therefore the additional air is required to idle your engine. Cap the T off and reset your idle adjustments. It isn't rocket science, these engines are dirt simple. To run they need spark, compression, fuel, and AIR, in the proper proportions.
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Post by Steve B on Aug 31, 2020 12:08:48 GMT -5
Make sure you're air filter is clean.
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Post by hybridcheef on Sept 1, 2020 0:01:50 GMT -5
Adjusting the idle screw seems to make very little difference, this bike is always been really weird on the idle screw. I can turn it out 2 turns and that's The Sweet spot but then I unscrew the throttle adadjustment screw to turn the throttle down and I can literally unscrew the throttle screw all the way to where it's not even touching and it still stays idling.but when it's like that and I pulled the throttle and let go it just dies, if I turn the throttle screw down a little bit when I let go of the throttle at least it stays idling how I have it now with the t connector in place. I think im having a different problem that may be causing this. I'm using a uni filter so there should be no clog. if I plug the t connector and restart from scratch there is no getting this thing to idle. so something else is going on. I'm probably going to have to take apart the carburetor and clean the Jets and do a valve adjustment oh, that's the only thing I can think of that would be causing this. And also one quick question? how the hell is the carburetor pulling in air from the vacuum line on the vacuum petcock? The vacuum line for the petcock is literally hooked up to the intake manifold vacuum Port not the carburetor on my bike
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Post by Steve B on Sept 1, 2020 4:09:31 GMT -5
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Post by FrankenMech on Sept 1, 2020 8:22:44 GMT -5
A little research on how a 4 cycle engine operates may help you. It sounds like you have manifold leaks etc.
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Post by hybridcheef on Sept 2, 2020 2:54:24 GMT -5
A little research on how a 4 cycle engine operates may help you. It sounds like you have manifold leaks etc. Dude you're joking right? I know how the motor works , that's exactly why I'm bringing up the fact that a vacuum line that's hooked to the petcock which is NOT connected to the carburetor, it's only connected to the intake. Why would it be interrupting the carburetor just by closing off a tee? It still has the whole entire intake to pull in air from. hence they're not even connected other than the intake manifold so why would open t line affect the carburetor that much. something else is underlying wrong with the vacuum or intake side of the carburetor but i don't need to learn how to work on them lol I've taken these things pretty far apart and installed a few big bore kits myself I think I have the idea lol.I diagnosed a few vacuum issues on a few mopeds before I've never ran across this issue so I was just trying to diagnose it without taking it apart myself, thanks for the video though |
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Post by FrankenMech on Sept 2, 2020 8:24:03 GMT -5
I am not joking. You obviously don't understand, it is a very simple problem, so therefore you need to do some study. I am too tired to laboriously explain the operation of a carb and an engine to you. Try Grumpy or someone else. I will discontinue all contact from you. I did not provide a video. There are many videos on the internet you might want to study though, some of them even may be useful if you think about them. Review what I have said before and make the appropriate adjustments. Stop thinking the carb and intake manifold are not connected.
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Post by Steve B on Sept 6, 2020 9:11:08 GMT -5
Hybridcheef, You can try turning you're idle up, then plug the vacuum leak. It seems like you're carburetor slide is ALL the way closed on idle, so the only air available to make the engine run is coming in from the vacuum line.
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