Clinician
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Post by jerimiah on Oct 15, 2014 10:33:37 GMT -6
I have a used 50cc chinese scooter. I took apart the CVK carb to clean. when I removed the brass jet for the accelerator pump, in the bottom bowl housing of the carb, behind it was a tiny spring and then a tiny ball bearing. After cleaning I filled the bowl with fuel and worked the rod of the accelerator pump and fuel squirted out a tiny machined hole in the bottom of the bowl instead out of the brass jet in the bowl. When I put my finger over the tiny hole then some fuel comes out of the brass jet. Shouldn't the fuel be coming thru the brass jet all the time?? and...is the ball a check valve for that to happen..Wondering if maybe the spring should go in first and then the ball (maybe assembled wrong before I got it)? Also the air fuel mixture screw has a spring, should it have a o ring and or washer on the carb side of the spring??? Any Diagram showing the ball and spring? Thanks for any help.
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Post by Alleyoop on Oct 15, 2014 11:25:33 GMT -6
You will see the indentation where the ball goes, the spring is to extend the plunger out again. As far as the Fuel Ratio Screw is concerned, look inside you MAY be able to see the tiny washer and behind it the rubber O-Ring. When you take out the screw only the spring will usually come out you have to bang it in your hand for the tiny washer and O-Ring to fall out. On some you have to get a tiny wire and pick them out. Alleyoop  |
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Clinician
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Post by jerimiah on Oct 15, 2014 12:55:55 GMT -6
You will see the indentation where the ball goes, the spring is to extend the plunger out again. As far as the Fuel Ratio Screw is concerned, look inside you MAY be able to see the tiny washer and behind it the rubber O-Ring. When you take out the screw only the spring will usually come out you have to bang it in your hand for the tiny washer and O-Ring to fall out. On some you have to get a tiny wire and pick them out. Alleyoop Thanks, I found the washer and o ring. As far as the accelerator pump, I am familiar with the diaphram and the rod and the spring assembly. What I am talking about is where the gas is pumped from that diaghram. Next to that assembly on the inside of the bottom bowl of the carb is a brass jet, which when unscrewed has a spring and a ball bearing, and my question is about that. |
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Post by Alleyoop on Oct 15, 2014 13:49:32 GMT -6
Hard to find a diagram for that, but it has to be ball bearing to close off the outlet and then the spring on the jet. So when the plunger is pushed down it creates pressure on the ball bearing allowing fuel to come out and then the spring closes it again.
So taking the Fuel ratio pic as an example the pumper jet you would have 4=jet,3=spring,2=ball bearing.
Alleyoop
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Clinician
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Post by jerimiah on Oct 18, 2014 16:14:45 GMT -6
Hard to find a diagram for that, but it has to be ball bearing to close off the outlet and then the spring on the jet. So when the plunger is pushed down it creates pressure on the ball bearing allowing fuel to come out and then the spring closes it again. So taking the Fuel ratio pic as an example the pumper jet you would have 4=jet,3=spring,2=ball bearing. Alleyoop Thanks for all the help Alleyoop. I put the carb back together and it runs great after making adjustments. I have another question in trying to understand how everything works on this scooter. There are 2 vacuum lines coming off the intake manifold, one goes to the gas pecock and the second vacuum line comes off the intake manifold and goes to what looks like a vacuum switch, which is not on the carb but near and mounted to the frame. The vacuum opens and closes a larger hose. One side of the larger hose goes onto a metal pipe that is mounted with 2 screws into the engine just below the valve cover.(Almost looks similar to the exhaust manifold). The other side of the larger hose extends to nowhere and has a black plastic small diameter canister type thing on the end of it. Pulling off the canister thing I cannot see through it but can easily blow air through it each way. It almost looks like a fuel filter. When the motor is running and creating vacuum the vacuum switch connects both sides of the larger hose and I can feel air coming out of the plastic canister side of the hose. Is this just an emission breather pipe from the crankcase? or?? Thanks |
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..BAD TO THE BONE..