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Post by brinkkl2000 on Oct 30, 2014 11:26:52 GMT -5
Hi guys, scratching my head on this one, and this seems to be the site to come to for help. I have a 2 stroke scooter, emblems say Hussar but I think it is a QiangJian, engine is a 1e40qmb. Anyway, it appears as though the oil pump failed and burned up the cylinder, so I rebuilt the top end and removed the oil pump so I could premix the fuel. I plugged the oil injection line on the carb. I also replace the auto choke and thoroughly cleaned the carb, and replaced the intake boot. On to the problem. The scoot will start and idle for as long as the key is on, left it at idle for about 30mins with no problem. As soon as I drive it around for a few minutes it will slowly start to die out, when it does this the engine starts to get loud, like it is growling at me, then it will die. I can then immediately, even while I am moving, start it back up and will have the same issue, gets loud and then dies, repeat over and over again. At first I thought the engine was seizing so I richened up the mixture, went from 32:1 to about 24:1. Every time it dies it will crank and has good compression. I removed the fuel tank thinking it was vapor locking, but that didnt do it. So I hooked my mighty vac up directly to the vacuum line to keep a constant pressure on the petcock, that didn't work. When it dies I can still see fuel in the fuel filter.
Summary: basically starts growling at me and slowly dies, will restart right away and do the same over and over. |
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Post by alleyoop on Oct 30, 2014 12:06:08 GMT -5
If when this happens the RPMS go up and then dies it is running really LEAN. You need to richen up the CARBs Mixture. Since it is a 2 stroke your carb most likely has an AIR RATIO screw on the right side near the AIR INTAKE. Turn that screw 1/8 clockwise to cut some air off to allow more fuel in the mix. After 1/8 turn try it and see if it gets better if it still does it but lasts a little longer before it happens turn it one time 1/8 turn clockwise. Alleyoop OR YOU CAN FOLLOW THIS PROCEDURE: itistheride.boards.net/thread/53/2ts-carb-tuning |
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Post by brinkkl2000 on Oct 30, 2014 14:46:58 GMT -5
Well, I tried to do as you suggested and came out with the same results. I turned it in to about 1/8 out from seated. Engine still runs for a few minutes, gets loud (sounds like it is stuggling) then slowly comes to a stop, then will start right up again. There is plenty of smoke, so I am assuming it is getting enough lube.
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Post by alleyoop on Oct 30, 2014 14:54:27 GMT -5
When you say it get sloud and then slows and dies DO YOU MEAN the ENGINE REVS UP quite a bit and then idles down and dies?
What appears is happening is fuel no longer is being sucked into the motor. Maybe look for cracked hoses or cracked intake manifold or a loose hose. Could also be the carb is running out of fuel and will only run until the fuel level gets below the jets then it dies for lack of fuel.
Some pictures of the fuel hose from the gas tank to the carb and pictures around the carb might help. Maybe able to spot something that your overlooking.
Alleyoop
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Post by brinkkl2000 on Oct 30, 2014 15:13:13 GMT -5
No, rpms remain constant and it just starts to bog down. About the only thing I haven't checked is the crank seals.
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Post by alleyoop on Oct 30, 2014 15:16:17 GMT -5
No, rpms remain constant and it just starts to bog down. About the only thing I haven't checked is the crank seals. Well that is not GETTING LOUD, if it bogs then it is still a fuel problem. So read what I posted in the previous post and see if you can check some things out. You do have the AIR FILTER On right? Take some pictures of what the carb area and fuel hoses look like. Did you make any changes or add or take off anything? |
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Post by brinkkl2000 on Oct 31, 2014 8:16:23 GMT -5
Not entirely sure how to upload an image to the site, do I need to first host it on another site and link to it? My carb looks just like the one in the link you posted.
Air box is on correct, spark plug is about black, which I know is way rich, so maybe there is an issue there, but yet it idles fine and runs fine until it dies. I guess loud would be the wrong term, but the tone of the engine changes to a low growl.
It does sound like the carb is starving for fuel. I put a new rubber intake boot and gasket on. The oil pump failed, which is why it burned down on the first place, so I disconnected it and plugged the oil injection port and am premixing the fuel. I connected the vacuum petcock to my mighty vac to keep constant vacuum on the petcock and I can see fuel in the filter. Guess in the meantime I will pull the carb and check it out, maybe the needle is sticking.
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Post by alleyoop on Oct 31, 2014 12:49:20 GMT -5
Well if the plug is black it is to RICH, Turn the Air mixture screw counter clockwise some more to let more air in. HERE IS HOW TO POST PICTURES USING THIS HOST. IT IS EASY AND FREE: 1. Click on this link: tinypic.com/index.php2. Click on Browse, that will link to your computer. 3. Find what you want to load. 3. Click on the name of the picture 4. Click on OPEN 5. Click on UPLOAD 6. Click on the LINK that starts with IMG. 7. RIGHT CLICK and CLICK on COPY 8. THEN Come here to your THREAD ON DOC. 9. RIGHT CLICK and CLICK ON PASTE. Alleyoop |
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Post by brinkkl2000 on Jan 15, 2015 10:38:34 GMT -5
Well,, I dont know if anyone is still interested in this thread, but I have a video that may explain things better. It can be found here, I think... tinypic.com/r/hrliqp/8or... View My VideoI hope someone can help shed some more light on what is going on... |
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Post by alleyoop on Jan 15, 2015 13:14:26 GMT -5
Hard to tell DO YOU HAVE AN AIR FILTER ON the Carb?
But that is a LEAN CONDITION if the RPMS RISE like that all by themselves.
Alleyoop
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Post by brinkkl2000 on Apr 16, 2015 12:05:00 GMT -5
Hoping to resurrect this a bit. If you watch the video, the rpms increasing is by my doing. What confuses me is the loud growling noise at the end of the vid. That is what is does if held at a higher consistent rpm. I just put a new carb on and it is doing the same thing. It will still start right up again and run until the engine runs out like the end of the vid...
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Post by geo49 on May 13, 2015 22:46:40 GMT -5
Are you using regular or synthetic 2-stroke oil?
Are you still holding the throttle open when it growls and stalls or do you let off the throttle then it growls and stalls?
You refer to the plug as being black.
Is it sooty black or wet black?
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Post by keikara on May 14, 2015 17:33:14 GMT -5
I may be totally off but when I watched the video, and where it growls and dies, to me it almost sounds like it is soft seizing, and then causing the motor to die out. I do not know anything about 2 stroke motors, but wondering if when you took the oil pump out, if it lubes anything other than injecting oil into the carb. Reason I am thinking this is I had let the oil get too low in my 150cc 4 stroke (had an oil leak and wasn't checking regularly) came to a stop at a light and the motor bogged down and died, would fire right back up but then when I tried to move would die again, pushed the last block to work checked and filled the oil and the problem went away. Again not sure if this could be the issue with the 2 stroke just thought would throw my 2 cents in.
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..BAD TO THE BONE..
