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Post by ʇwiƨtɘdburnout on Mar 8, 2013 23:21:42 GMT -5
That's what I was worried about was someone said something about the needle and the angle of it or something? And my carb I found out today is a 20mm not a 18mm like I thought, lol! (duh) I also looked for that pump and it is in there thank goodness.
I went to buy an air filter, fuel filter and fuel line today and the inside rim of the intake was 1 5/8" that means 20/40mm right? .78x2
And 18/36mm would be 1.5 .75x2? right?, Lol!
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Post by ʇwiƨtɘdburnout on Mar 8, 2013 23:27:52 GMT -5
Uh oh!!! Just found a reason for my problem maybe? Is this thing important? It looks like it. Mine is gone. Also on the factory airbox, when I took it off had a line going to it that's not hooked up to anything right now. Going up towards the front. Attachments:
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Post by 90GTVert on Mar 9, 2013 7:30:25 GMT -5
There are 25.4mm in an inch, so to convert inch to mm just multiply inches by 25.4. 1 5/8" would be 1.625" x 25.4 = 41.275mm. If you need to convert mm to inches, then divide mm by 25.4.
That hose is just an overflow hose. When the bowl overflows it allows you to direct the fuel so it won't pour onto a hot engine. The carb shown is a 2T carb, they just have a short elbow. The 4T carbs usually have a longer hose that really does route the fuel away.
Trace that lie from your airbox as far as you can. If it goes to the very front of the engine, see if your valve cover has a port that is open. If so, that hose may have went there.
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Post by ʇwiƨtɘdburnout on Mar 9, 2013 13:07:58 GMT -5
I did find that line going way up front of the engine thanks  So I have two over flows? One there and another in the float bowl? |
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Post by 90GTVert on Mar 9, 2013 14:57:07 GMT -5
No, that's linked to the float bowl. The bowl is the only thing that actually holds fuel that can overflow.
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Post by ʇwiƨtɘdburnout on Mar 9, 2013 17:08:36 GMT -5
Ok, so the hose that goes from the way up front to the carb is part of the overflow that comes out of the bottom tube on the float bowl? So I lost vacuum, and maybe because that was disconnected it caused the gas to come out of my air filter?
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Post by 90GTVert on Mar 9, 2013 21:52:14 GMT -5
Usually the bowl drain hose on the GY6 just goes straight down and sometimes has a metal end on it with a drain screw and mounting tab.
Your issue really sounds like a float related problem to me.
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Post by ʇwiƨtɘdburnout on Mar 9, 2013 22:31:00 GMT -5
Well tomorrow is fuel system overhaul and carburetor surgery day so we are going to find out. I think your right though, I'm guessing it's the float also. I will be posting picks as I go and begging for help I'm sure lol! I looked all over the internet and for the life of me, can not find a fuel and vac diagram for my model. Plus the hose coming of the right side of my intake is pinched off with a ziptie from the factory. It's getting very confusing. My trike is built on a BMS so that's what I would need but I don't think BMS makes a 50cc, only 150. It's nutty.   |
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Post by ʇwiƨtɘdburnout on Mar 10, 2013 14:33:00 GMT -5
Is it okay to run the bike for a minute with no air filter to see if gas is still coming out from there?
I have it hooked up and ready to run.
I'm going to try this new line install before I tear the carb apart because some things looked suspicious.
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Post by ʇwiƨtɘdburnout on Mar 10, 2013 14:56:15 GMT -5
Here is the before and after pics of my new lines are they right? I want to start it and make sure gas isn't flying out of the intake anymore before I put the new double layer UNI on. Attachments:
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Post by 90GTVert on Mar 10, 2013 15:07:27 GMT -5
The crankcase ventilation on the valve cover should not be going to your carburetor. Normally that would be going to a fitting on the airbox. I think it's hooked to your overflow hose. So basically you are routing pressure (and oil vapors and heat) from the crankcase into the bowl of your carb. Bad idea.
The tube that is pinched off needs to be securely pinched off or remove the tube and use a vacuum cap or put a screw in the end that totally blocks any air from passing. Otherwise you have a vacuum leak there.
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Post by ʇwiƨtɘdburnout on Mar 10, 2013 16:23:20 GMT -5
So just leave them open? Attachments:
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Post by ʇwiƨtɘdburnout on Mar 10, 2013 17:18:11 GMT -5
Ok, I fired it up, good and bad news, now gas is NOT pouring out of my filter anymore, but gas is leaking from around the float bowl seal gasket, and the overflow is pouring like a fountain! Even well after I cut the engine, I still see gas traveling from the petcock into the visa-clear inline filter I just purchased. It "is" the floats isn't it? Or worse?  But if so? Why is fuel continuing to flow into my line filter? Petcock is bad also? Its attached to the tank. Please help  |
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Post by 90GTVert on Mar 10, 2013 19:19:52 GMT -5
Don't leave both of those open. The carb connection can stay open, it's an overflow. The connection from the valve cover should have a free spot on the airbox to connect to or you can do something like this... 49ccscoot.proboards.com/thread/997/crankcase-ventingYou need to take the carb off and see what's going on. Sounds like you still have the issue with the float or needle/seat and now you also have the bowl not sealing. The gasket around the bowl is easy to get seating wrong if not paying close attention on reassembly. If fuel flow doesn't stop when the engine is off, then your vacuum petcock is not working. Honestly, I'd see that as a good thing. I don't like the vacuum ones and prefer to put a manual cutoff inline. You could just do that and you can choose to turn it on and off. If you like that it shuts of fuel automatically, then you need to replace it. Remove it and you'll have to measure the threads and check the measurements that the seller provides to see if they match up since there are different sizes. The petcock is not going to totally solve your issue though. It may keep it from overflowing when not running, but a properly functioning carb can handle fuel being gravity fed to it full time. My scooters all have manual shutoffs and usually I leave them on unless they are gonna sit for a very long time. |
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Post by ʇwiƨtɘdburnout on Mar 10, 2013 19:43:18 GMT -5
Awesome link thank you.
I will be online when I tear in to this carb tomorrow. I'm going to need all the help I can get, lol!
Broken petcock is good huh? lol! I hear ya. I was reading what you wrote in the shoutbox earlier and thought about replacing it with one.
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