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Post by kxj5906 on Jan 27, 2014 9:15:27 GMT -5
I am having carburetor issues and thought you might be able to help. The issues actually run a bit deeper than that so let me give you the full rundown and you can let me know what you think. The scooter is a Boss 50 (Ruckus knockoff). It ran fine. Then my wife got a 150 and it sat for six months. Then when I tried to start it and it wouldn't idle, just shut off. I first tried to increase the idle using the idle screw. That didn't work, it would just rev high and get stuck high for a second and then shut down.
I thought it might be my fuel line and fuel filter so I changed them both, still won't idle. Then I tried to clean the carburetor but the carburetor was the sealed type with no screw heads to remove the float cover. I bought a new carburetor and installed it today. Still won't idle, will start on kick but won't idle. But to add to that problem, there is white smoke coming from my intake manifold right under the clamp. I assume this is fuel and is burning off but it has done it all four times I tried to start it and I am afraid it might catch fire so I have just stopped messing with it. Plus, the intake manifold is plastic not metal so I didn't want to burn up the part.
The scooter is in my work shop with plenty of room to work on it. I'd like to know what you think. I would like the carburetor checked out and the idle prob fixed.
It's a 4 stroke basic gy6 motor. It just smoked when I re-installed the new carburetor.
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Post by urbanmadness on Jan 27, 2014 9:25:58 GMT -5
I'm thinking you need to replace the intake manifold. If they leak you will have a huge vacuum leak and the bike won't idle. The "white smoke" is probably fuel vapor leaking out when you shut it down.
The intake manifold on these bikes is just made of rubber and the carb hangs off of it. Vibration and dry rot take their toll.
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Sophomore Rider
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Post by phssthpok on Jan 27, 2014 11:47:37 GMT -5
I'm thinking you need to replace the intake manifold. If they leak you will have a huge vacuum leak and the bike won't idle. The "white smoke" is probably fuel vapor leaking out when you shut it down. The intake manifold on these bikes is just made of rubber and the carb hangs off of it. Vibration and dry rot take their toll. I second the initial assessment. Investigate the manifold by removing it from the engine and inspecting it closely for cracks. If there are cracks, and they are minor, you can try coating the OUTSIDE of the manifold in silicone 'caulk' as a test procedure. I actually ran a manifold like this for a couple weeks until a replacement could be procured, and it was still working fine when I swapped it out for a fresh one. I kept the 'old' one in a small zip-lock bag of used, but 'known good' parts that I've replaced (CDI, coil/plugwire, sparkpug, manifold, etc) under the seat as 'road spares'.
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Post by kxj5906 on Jan 27, 2014 13:20:23 GMT -5
Thanks, any GY6 intake manifold should fit correctly?
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Post by urbanmadness on Jan 27, 2014 14:12:59 GMT -5
The 50cc and the 150 use different manifolds but other then that, they are pretty universal.
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Post by JerryScript on Jan 27, 2014 18:08:52 GMT -5
Just don't go with the cheapest only for price's sake. There are tons of formulations for the plastic/rubber/whatever used in these parts, and the cheapest will often dry rot much faster than one that costs a few dollars more. I'm not suggesting get some performance part, just don't go as cheap as possible on this one. Perhaps one of the experts can recommend a good brand here.
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Post by kxj5906 on Jan 27, 2014 19:55:59 GMT -5
Thanks, I'll try replacing the manifold
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Post by alleyoop on Jan 27, 2014 20:18:15 GMT -5
I really do not think it is the intake manifold, question where was the scoot stored. Also just start it up once more and put your palm on the white smoke and see if it wets your hand. Then smell it and see if it is gas blowing out. It could be condensation depending on where it was stored. If it is gas that means it is blowing gas back out through the valve. So first thing before anything else Adjust the valves on it .004 inchs on both intake and exhaust. A cracked or leaking intake manifold all that will do is making it run lean.
Also the intake manifolds have metal inside it is a tube covered with rubber then about 1" of it does not have metal and it is all rubber so you can fit your carb in and clamp it down. Alleyoop
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Post by skuttadawg on Jan 28, 2014 12:15:24 GMT -5
How does ir perform ? I had a TaoTao that I bought new that fizzled on the 2nd day . I took it to the shop since it was new and under as warranty . My dealer pulled off the hose on the valve cover and it had white smoke which he said was bad . It had a hair line crack in the piston
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