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Post by dcustriker on Oct 4, 2014 14:29:07 GMT -5
 I'm trying to find out where I need to inject fuel in the carburetor in order to prime it. Trying to get fuel delivery from gas tank to the carb. After replacing vacuum hoses, fuel hoses, fuel filter, and fuel pump, and still not having any luck getting fuel out of the tank, I'm hoping that if I fill the carb up and the fuel lines, it'll get the pump getting fuel out of the tank. I removed the gas cap as well with no go. I believe that I put fuel into the little rubber hose on the left of the carburetor (I believe it is the fuel bowl vent?). I turned it up in this picture. I just wanted to make sure I would be putting it in correctly. Thanks! |
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Post by katastroff on Oct 4, 2014 14:39:57 GMT -5
If fuel is not going to your carb, i think it could be 2 things:
-When replacing your hoses you forgot/misplaced/mixed up some of them.
-You got a faulty petcock valve/pump depending wheter you have a below or above the carb fuel tank.
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Post by dcustriker on Oct 4, 2014 15:01:29 GMT -5
I took the hoses off one at a time while replacing them. Checked them all over as well and all looks good. I removed the vacuum hose from the pump to make sure that I was getting a pulse. Looked good. The fuel pump is a brand new Mikuni Fuel pump. I've got the fuel coming into the pump from the connector pointing into the pump, and fuel going out where the arrow points out of the fuel pump. The vacuum hose is connected to the golden connector in the middle of the pump. Just mentioning that to make sure it is connected properly. The only thing I can think to do at this point is prime the carburetor which will hopefully get that vacuum pump working the way it needs to. If this doesn't work I really have no idea where to go from here. I've got my battery charging as well just to cover all bases.
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Post by katastroff on Oct 4, 2014 15:09:01 GMT -5
If your bowl is empty, it might take some starting to get the suction to fill it up.
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Post by alleyoop on Oct 4, 2014 16:28:06 GMT -5
Yes that hose you have pointing up is the OVERFLOW and VENT hose, so pour 1 1/2 ozs of fuel to prime the carb.
Now where is your gas tank BELOW the CARB or ABOVE the CARB? Take a picture of the Fuel Pump or Petcock.
Alleyoop
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Post by tvnacman on Oct 4, 2014 16:38:34 GMT -5
suck on the vac hose , do you have a clear fuel filter ? If so you can see it fill up and stop . then you know you have fuel in the carb . I have sucked fuel into vac lines to prime .
John
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Post by dcustriker on Oct 4, 2014 20:30:27 GMT -5
The priming worked. Scooter is finally running again! Only thing is I still sometimes have to give it some throttle to get it to start. Other times it just fires right up. Any kind of adjustments I should do to the carburetor?
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Post by tvnacman on Oct 4, 2014 20:55:08 GMT -5
what is your idle set at ? maybe push it up some .
how did yo get it primed ?
John
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Post by dcustriker on Oct 4, 2014 21:17:29 GMT -5
I poured about an ounce of fuel into the carb via the fuel vent. (The piece I mentioned earlier.) Im Not sure about what it is set at since I don't have anything to tell me my Rpm. I kinda set by ear.
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Post by bashan on Oct 4, 2014 23:22:22 GMT -5
You don't need a tach to set your idle. Put the bike on the centerstand and set the idle so that the rear wheel has just stopped moving. That's with the A/F screw out to 2 1/2 turns if the mixture is right. Alley may have already touched on that.
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Post by dcustriker on Oct 5, 2014 17:38:56 GMT -5
So I sort have a new issue now. The scooter starts up fine and seems to do good at lower speeds. However when I hit the 40-50 speed areas, I get a feeling like it is struggling to keep up. Kinda goes into spurts the. Eventually shuts off. It starts back up, but it takes a little time (probably filling the carburetor bowl up) before it kicks on and goes for a bit longer before dying and repeating the process. My guess is a vacuum leak. I'm thinking of getting a vacuum pressure tester and seeing what I'm getting from the fuel pump. Anyone know what readings I should get or a good cheap method to investigate where a vacuum leak my be? I wouldn't think he caburetor would be dirty yet, since the scoot only has about 100 miles on it.
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Post by dcustriker on Oct 5, 2014 18:29:30 GMT -5
Or needs a valve adjustment. Would it actually shut off though? Or would it just lose power at higher speeds if the valve adjustment was off?
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Post by alleyoop on Oct 5, 2014 18:41:38 GMT -5
If you have a vacuum leak it would Bog, what sound does it make when this starts to happen. The sound a motor makes tells you what it needs. So listen to what sounds it makes, BRAT, BOG, POP etc..
Alleyoop
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Post by dcustriker on Oct 5, 2014 21:31:18 GMT -5
I want to say it sounds like Bog. It starts hesitate, then picks up, and repeats for a bit until it dies out.
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Post by alleyoop on Oct 5, 2014 21:42:50 GMT -5
Ok to determine what the problem is, LACK of FUEL or TO MUCH FUEL, when it just starts to act up BACK OFF THE THROTTLE about 1/8 to 1/4 of an INCH and HOLD IT THERE and NOTICE and pay ATTENTION to what the motor does.
A. Does it speed up
B. Does it settle down
Alleyoop
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..BAD TO THE BONE..
