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Post by tootie on Mar 24, 2019 20:00:45 GMT -5
Hi to all - I have a maddog scooter with a 150cc gy6 motor. I am not sure that the vacuum hoses are connected right. The motor has three places to put on a vac hose. Two nipples on either side of the intake manifold. These suck vapors directly into the engine, bypassing the carb entirely. I assume that there is no difference between the two. And one nipple on the upper part of the carb. The one on the carb looks like it is part of a diaphram system. The scooter has a vacuum operated fuel pump and it has to be connected to the intake manifold or it wont work. There is another hose system that sucks vapors from the valve cover and from the transmission. I assume that these are connected to the manifold also. But that leaves me with a nipple left over. I do not know what to connect to the nipple at the top of the carb. Any help or ideas?
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bluebob71
Scoot Enthusiast
Posts: 192
Location: mt.pleasant, mi
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Post by bluebob71 on Mar 24, 2019 22:47:19 GMT -5
Hi to all - I have a maddog scooter with a 150cc gy6 motor. I am not sure that the vacuum hoses are connected right. The motor has three places to put on a vac hose. Two nipples on either side of the intake manifold. These suck vapors directly into the engine, bypassing the carb entirely. I assume that there is no difference between the two. And one nipple on the upper part of the carb. The one on the carb looks like it is part of a diaphram system. The scooter has a vacuum operated fuel pump and it has to be connected to the intake manifold or it wont work. There is another hose system that sucks vapors from the valve cover and from the transmission. I assume that these are connected to the manifold also. But that leaves me with a nipple left over. I do not know what to connect to the nipple at the top of the carb. Any help or ideas? post some pics the one on the carb usually goes to the manifold |
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Post by jdl357 on Mar 25, 2019 10:48:38 GMT -5
Usually one goes from the intake to the carb, and one from the intake to the fuel petcock if you have the stock setup.
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Post by jackrides on Mar 25, 2019 11:51:21 GMT -5
The one at the top of the carb probably is the float bowl vent. A hose coming down from that and open at the end helps keep debris out.
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Post by 2stroked on Mar 25, 2019 12:06:45 GMT -5
Usually one goes from the intake to the carb, and one from the intake to the fuel petcock if you have the stock setup. One to the carb other to the pump in this case. |
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Post by tootie on Mar 26, 2019 12:17:20 GMT -5
Usually one goes from the intake to the carb, and one from the intake to the fuel petcock if you have the stock setup. I did not think of connecting the vacuum from the intake manifold to the nipple on top of the carb - I will give it a try - thanks The nipple on the top of the carb looks like a diaphram system - do you know what it does - I dont have a clue |
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Post by 2stroked on Mar 26, 2019 19:47:07 GMT -5
Usually one goes from the intake to the carb, and one from the intake to the fuel petcock if you have the stock setup. I did not think of connecting the vacuum from the intake manifold to the nipple on top of the carb - I will give it a try - thanks The nipple on the top of the carb looks like a diaphram system - do you know what it does - I dont have a clue Depends.on the type of carb. On mine it is responsible for the antipop shit when you release the throttle. |
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