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Post by robburgandy on Jun 7, 2013 22:25:11 GMT -5
So I bought this scooter that wasn't running, after much research, and some guess work I got it running. I'm new to this whole scooter thing so anything you can help me with would be awesome!
Long story short I ended up replacing almost everything I could think of. After finally replacing the carburetor I got it up and running. It had a little trouble idling at first, but I assumed that it was just because it hasn't run in at least a year or so. Anywho when I took it out on its first joyride it was doing great, I noticed that when It was running faster it would feel like it was going to give out, so I just didn't push it too much. Anyway 15 min into it the thing just goes out. I tried to start it over and over and after 15min of trying and turning the throttle a little it started again only to die in like 1min.
Does anyone have an idea of what I should do to get it up and running again?
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Post by scootnwinn on Jun 7, 2013 22:28:50 GMT -5
Did you ever drain the ancient "once was fuel" crud out of the tank?
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Post by skuttadawg on Jun 7, 2013 22:44:28 GMT -5
Check the valve gaps as most shade tree wrenchers do not know about this common issue
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Post by robburgandy on Jun 8, 2013 9:49:31 GMT -5
[replyingto=scootnwinn]scootnwinn[/replyingto]I didn't think to drain the old gas out...
I did get some new gas and put it in the tank. Do you think that would cause it to just give out like it did?
And I set both of the gaps tp .004, I have a 2007 50cc peace sports. I heard that .003 is slao good for both gaps. I might try and get them a little closer and see if that helps
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Post by scootnwinn on Jun 8, 2013 10:05:56 GMT -5
You need to clean the entire fuel system now. You likely pulled a whole mess of crud into the carb so you will need to drain and flush the fuel tank and clean the carb. You can check to make sure everything else is right before you do this by spraying a shot of carb cleaner into the intake and see if it will fire up if it does the fuel system needs to be addressed. It us unlikely that .001" difference in plug gap is your issue...
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Post by robburgandy on Jun 8, 2013 10:53:37 GMT -5
[replyingto=scootnwinn]scootnwinn[/replyingto]How do I go about cleaning the fuel system?
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Post by indymoped on Jun 8, 2013 11:21:38 GMT -5
Remove the petcock from the bottom of the fuel tank to get all the gas out of there. Then drain the fuel hose out and spray carb cleaner thru it. Next drain the carb with the drain screw on the bottom and spray some carb cleaner thru the gas line inlet nipple to fill the float bowl. Let it sit a minute and then drain it out using the float bowl drain screw. Close the drain screw, put the petcock back in the tank, attach the fuel line and fill it with fresh gas (I recommend  octane some scoots specs placard only calls for 87 octane but I always run the highest I can get). Hopefully it will start now. if it doesn't you need to take the carb off and take it apart and clean the whole thing. |
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Post by justputtnaround on Jun 8, 2013 11:57:06 GMT -5
DX
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Post by pmatulew on Jun 8, 2013 13:37:19 GMT -5
Those squeeze bulb siphon tubes meant for kerosene heater re-fills actually work great for quickly draining a scooter fuel tank. Less mess that way when you take the petcock off the bottom.
Do a quick search on "kerosene heater siphon hand pump" and you'll see exactly what I'm talking about.
Old gas in a 50cc? Oh yeah, The smaller the motor, the more fussy they are about fuel quality. You probably sucked up some gunk or dirt and plugged one of the carb jets. Out with the old, in with the new. DX
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Post by robburgandy on Jun 10, 2013 11:44:50 GMT -5
Well I drained the tank, cleaned out the carb and all and so far no luck. I think I found what the problem is, but I'm still going to need some asistance.
I noticed that when I crank my scooter it isnt getting enough suction to draw the gas into the carb. I ordered a new intake manifold and some new vacuum lomes to try and solve the problem. But heres where I really have some trouble...I'm wanting to make sure that I am hooking everything up correctly. My scooter, unlike the majority of scooter diagrams I have looked at, doen't have a t-splitter in the vacuum line, my intake manifold has two vacuum ports and no of them lead to the carb. But nearly every fuel/vacuum diagram I look at has a vacuum line going into the carb. So now I'm all confused! if you could give me a pointer in the right direction I'd be forever grateful.
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Post by millsc on Jun 10, 2013 12:03:46 GMT -5
You probably have a bad petcock
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Post by pmatulew on Jun 10, 2013 12:10:09 GMT -5
Any port between the cylinder head and the butterfly valve in the carburetor (the circle plate attached to the throttle cable) will be a vacuum port. They should all be at the same negative fluctuating pressure so it doesn't much matter if you have multiple hoses going to multiple ports or if they are all connected to one port with T's and Y's. So long as none of the vacuum ports are venting directly to outside air pressure.
When you say it's not drawing gas into the carb, do really mean IN? As in no fuel in the carburetor bowl? Or not sucking atomized fuel out of the carb into the intake? Could this still be a fuel delivery problem? Petcock screen? Petcock vacuum? Fuel pump? Fuel pump vacuum?
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Post by robburgandy on Jun 10, 2013 12:11:15 GMT -5
I have a brand new petcock installed. I thought that was originally the problem so i changed it out. And when I pull the vacuum line off the intake and suck on it gas comes pouring out. Unless I just had two bad ones, which would probably be my luck anyways.
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Post by robburgandy on Jun 10, 2013 12:17:01 GMT -5
[replyingto=pmatulew]pmatulew[/replyingto]Well when I start it and turn the throttle a little I can see it pulling the gas to the petcock, but it's not making it to the other gas line on the other side that runs into the carb, and like I said its a brand new petcock, I havn't even used it yet.
I heard that the intake manifold can crack and create an air leak? Which is why I ordered a new intake to see if it would help with the suction to draw the gas into the carb
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Post by pmatulew on Jun 10, 2013 17:19:02 GMT -5
So, from your description, you have clear fuel lines and the petcock is separate from the fuel tank so it has and in and an out.. You apply vacuum to the vacuum port of the petcock and fuel passes through normally. When you re-connect everything to the motor, the fuel does not get from the petcock to the carburetor?
As a test can you connect the fuel lines as they should be and then apply vacuum to the vacuum port to see if fuel flows through the petcock and fills the carburetor bowl? That would eliminate the possibility any blockage between the petcock and the bowl. Is your fuel tank high mounted so that it should be gravity feed or is it low mounted and there is (or should be) a fuel pump somewhere?
Also cracking the throttle open will actually reduce the intake vacuum since you are allowing ambient air to bypass the throttle plate.
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octane some scoots specs placard only calls for 87 octane but I always run the highest I can get).
