150cc scooter with fuel issue

jatgm1 · 06-23-2017, 11:55 AM

I have a mc-06 scooter/motorcycle that if you ride for a while shuts off. But if you take the gas cap off, and then start it up it runs again. Like wtf. And when I take off the cap it hisses like there's either negative or positive pressure. I just replaced the gas cap with one from my old gas powered bicycle that happened to fit. I know the tank had to be vented on the gas bike so maybe this will help. Hell if I know.

jatgm1 · 06-23-2017, 11:56 AM

Oh and it has a fuel pump so ya.

Weldangrind · 06-23-2017, 01:55 PM

That's not the first time I've heard a report like that, although it is the first for a scooter. Perhaps it uses a ball and spring in the cap (like a check valve) and the spring is too strong or the ball is gummed up. Can you do some surgery on it?

tortoise · 06-23-2017, 04:55 PM

mc-06 scooter/motorcycle . . that configuration has a pulse pump

jatgm1 · 06-30-2017, 09:59 AM

i replaced the cap with one from a gas powered bicycle, works fine now. i think the chinese forgot to drill a vent hole because other than that their identical..

06-23-2017, 11:55 AM	#1
jatgm1 Join Date: Apr 2017 Posts: 147	150cc scooter with fuel issue I have a mc-06 scooter/motorcycle that if you ride for a while shuts off. But if you take the gas cap off, and then start it up it runs again. Like wtf. And when I take off the cap it hisses like there's either negative or positive pressure. I just replaced the gas cap with one from my old gas powered bicycle that happened to fit. I know the tank had to be vented on the gas bike so maybe this will help. Hell if I know.
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06-23-2017, 01:55 PM	#3
Weldangrind Join Date: Mar 2009 Location: Sardis, BC, Canada Posts: 25,977	That's not the first time I've heard a report like that, although it is the first for a scooter. Perhaps it uses a ball and spring in the cap (like a check valve) and the spring is too strong or the ball is gummed up. Can you do some surgery on it? __________________ Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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06-23-2017, 11:56 AM	#2
jatgm1 Join Date: Apr 2017 Posts: 147	Oh and it has a fuel pump so ya.
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06-23-2017, 04:55 PM	#4
tortoise Join Date: Jan 2008 Posts: 221	mc-06 scooter/motorcycle . . that configuration has a pulse pump
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06-30-2017, 09:59 AM	#5
jatgm1 Join Date: Apr 2017 Posts: 147	i replaced the cap with one from a gas powered bicycle, works fine now. i think the chinese forgot to drill a vent hole because other than that their identical..
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