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Post by jtron on Jul 7, 2015 14:31:04 GMT -5
So I noticed that when I unhooked the fuel line to the carb fuel just kept coming out through the line...isn't the petcock supposed to stop the fuel if there's no vacuum? Its like brand new so idk why it would already fail. I've noticed no running problems tho. Should I just spend 5 bucks for a new one? I'd get a manual one but I figure it would be a pain to get to
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Freshman Rider
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Post by nimajneb on Jul 7, 2015 14:56:54 GMT -5
Yah it is supposed to stop it. The needle in the carb should stop it from over filling the carb but those will can can fail also. I would get one just to be on the safe side. They are cheap and the rubber inside them breaks up very easy.
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Post by onewheeldrive on Jul 7, 2015 15:20:42 GMT -5
When you pull the line off at the carb, the only fuel that should come out is the fuel that has already passed the petcock. Once that drains, fuel flow should then stop.
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Post by geh3333 on Jul 9, 2015 17:09:58 GMT -5
Get rid of the vacuum valve and use a manual shutoff .
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Post by jtron on Jul 9, 2015 17:41:35 GMT -5
I may do that, but my scoot is kind of a pain to get under, theres a rubber skirt n stuff I have to manuever around. If I get any problems with my new valve ill probably just do that though
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Post by scooter on Jul 9, 2015 19:08:44 GMT -5
I may do that, but my scoot is kind of a pain to get under, theres a rubber skirt n stuff I have to manuever around. If I get any problems with my new valve ill probably just do that though If you want to work on your scooter, it helps to remove body work. It becomes very easy to do once you do it a few times and makes your work a lot easier. It's actually a little scary how few screws these scooters have holding them together.  Embrace the removal of the body panels, not as a hassle to deal with, but as a way to make your work more rewarding and enjoyable. If the petcock is hooked up wrong, it may free flow. I would check it and prepare to put a new one in if necessary. It's probably a half hour job or less. |
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Post by scooter on Jul 9, 2015 19:13:02 GMT -5
Get rid of the vacuum valve and use a manual shutoff . Did you see my post "50 cc won't start"? I need a specialist over there. Someone who knows about piston rings and cylinders and all that. That Jersey fellow seems to be pretty good at that stuff too. I haven't seen him on here lately though. Anyway, it looks like I'm going to be doing my first top end rebuild. Come over and check it out. itistheride.boards.net/user/2253/recent_threads |
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Post by jtron on Jul 9, 2015 23:46:30 GMT -5
Lol...I take it apart when I work on it obviously. I just dont wanna have to deal with a manual petcock if I dont need to as it would be kind of a pain to access. And knowing how forgetful I am I'd forget about it all the time
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Post by rcq92130 on Jul 10, 2015 0:21:54 GMT -5
Lol...I take it apart when I work on it obviously. I just dont wanna have to deal with a manual petcock if I dont need to as it would be kind of a pain to access. And knowing how forgetful I am I'd forget about it all the time I presume your gas tank is higher than the level of the carb so you do not need a pump. otherwise I'd recommend ditching the vacuum crap altogether and getting an electric pump - join at least the 20th century! but presuming you do not need a pump, a few things: 1. you can locate the manual petcock anywhere that is convenient. it is NOT necessary to locate it in the same place, if that's inconvenient. 2. The times you forget to turn a petcock off are of no concern. Almost all carbureted motorcycles have a manual petcock and NOBODY turns them off. The float valve will stop the flow of fuel just fine ... and when it fails you will want to replace it anyway, manual petcock or not. 3. Make sure you have removed all ChinaRubber. Nothing will destroy your fuel system more surely than little pieces of partially dissolved rubber floating around. ChinaRubber is made of cardboard - I am convinced of it. |
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Post by scooter on Jul 10, 2015 17:21:43 GMT -5
Lol...I take it apart when I work on it obviously. I just dont wanna have to deal with a manual petcock if I dont need to as it would be kind of a pain to access. And knowing how forgetful I am I'd forget about it all the time I get what you're saying now, and I agree that having the vacuum actuated petcock is nicer. |
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Post by geh3333 on Jul 10, 2015 17:50:23 GMT -5
Lol...I take it apart when I work on it obviously. I just dont wanna have to deal with a manual petcock if I dont need to as it would be kind of a pain to access. And knowing how forgetful I am I'd forget about it all the time I get what you're saying now, and I agree that having the vacuum actuated petcock is nicer. I never turn mine off , unless I am working on fuel line or whatnot. Other then that it stays open. The flaot valve shuts the fuel off at the carb when the bowl is full . no need to turn the manual valve off. |
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Post by geh3333 on Jul 10, 2015 17:51:39 GMT -5
And as u can see I renamed the float valve . it is now flaot valve !!
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Post by scooter on Jul 10, 2015 18:17:57 GMT -5
I get what you're saying now, and I agree that having the vacuum actuated petcock is nicer. I never turn mine off , unless I am working on fuel line or whatnot. Other then that it stays open. The flaot valve shuts the fuel off at the carb when the bowl is full . no need to turn the manual valve off. On my motorcycles I always turned them off, but they are right out in plain sight, and besides, I had no idea what would happen if I left them on. All I knew at the time, was that the carb mixed air and gas, and would indeed flood the engine, fail to start it, or spit gas out, by virtue of some mystical evil forces, and that if you took it apart and cleaned it, then it would usually work.  .. but what if.... your needle valve didn't close one day, and flammable gasoline ran down onto your motorcycle engine, and it went up in flames.. in your garage.. at night.. in a neighborhood without a fire department. and your wife is about to have a baby.. and you have to take her to the hospital on your scooter. and now you'll have to give birth to your child alone in the dark in the winter, while you watch your house burn down. think about it.  and there's a bear... |
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Post by geh3333 on Jul 10, 2015 18:24:07 GMT -5
Lol. I thought about that exact scenario , but I think leaving it this way actually keeps the needle valve in good shape. Or at least that's my theory, lol
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Post by jtron on Jul 10, 2015 21:19:13 GMT -5
Don't leave food in the seat compartment if you have a bear problem
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