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Calling BS carb guru's !

  • Thread starter Thread starter Jitsufighter
  • Start date Start date
J

Jitsufighter

Guest
So im having a major overflow problem... ill try and include all the information i can about what ive done. The gas is mainly pouring/shooting out of the port (if your facing the airbox side) on the right side, not air jet hole but the other. Im wondering what would cause this. Ive adjusted floats to reccomended hight, ive even tried raising them so they woukd seat the needle harder and didnt help. Ive cleaned them well (boiled water with pinesol, guitar wire in passageways, carb cleaner, and compressed air) and installed new float needles, also tried swapping back to the old float needles. This problem happens while hooked up to a tank and a fuel resevior. So ive taken the float bowls off the carbs and physically held the needle closed and it stops the fuel flow.... so when the fuel turns on, instantly all carbs at the same time squirt fuel out of this port. I know i need to do the rubber hose test to check the float level in the bowl but its kind of hard im getting covered in fuel and its getting exoensive!! Haha... ive been on the bassclif site but i was also wondering if anyone has seen any literature for diagnosing the carbs instead of just tuning them for running.

The bike is a 1980 gs850 with BS32ss carbs

Even a step in the right direction would be greatly appreciated, at least some more techniques for diagnosing this problem.. could the slide needles not be stopping the flow to that passage??

Thanks guys, this site has awesome people on here, i know we can figure it out!
 

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Any chance you have the fuel line connected to the vent lines? If not, then it MUST be a float valve problem. Is the gas coming out of all 4 carbs?
 
If you replaced the float bowl gaskets with some cheap aftermarket ones they could be catching the floats with the bowls on and holding them open
 
I've had pin hole leaks in the old Brass floats that would cause this problem. Usually worse after I clean the carbs and remove the old corrosion.
 
smilinbrad said:
I've had pin hole leaks in the old Brass floats that would cause this problem. Usually worse after I clean the carbs and remove the old corrosion.
Click to expand...

This is exactly what happened to me on my GS450. Drove me insane trying to figure it out until I shook one of the floats and heard liquid inside.
 
JTGS850GL said:
Any chance you have the fuel line connected to the vent lines? If not, then it MUST be a float valve problem. Is the gas coming out of all 4 carbs?
Click to expand...

Yeah shoots out of all four carbs at the same time
 
I was thinking leaky floats, but the fluid overflows so quickly, and all four carbs at the same time.. does this sound familiar?
 
I did not replace the gaskets they were in good condition.. but ill examine them further.
 
Im gonna check this out cause i did spray the plastic floats with carb cleaner to remove corrosion... its gotta be leamy floats. You can just toss em in a bowl of water to see if they float or sink correct?
 
I have seen the old brass floats leak, but I haven't seen a plastic one leak yet. Keep us posted.

Also, if they are leaking, you can hold them down in a cup of water for a couple minutes then pull them out and shake them. You'll hear and feel the water moving around.
 
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TxGSrider said:
I have seen the old brass floats leak, but I haven't seen a plastic one leak yet. Keep us posted.

Also, if they are leaking, you can hold them down in a cup of water for a couple minutes then pull them out and shake them. You'll hear and feel the water moving around.
Click to expand...

Well im hear testing the floats... they all float and can hear no leaks. What the heck is goin on.. the gaskets also look perfectly aligned with the edge of the float bowls. Im stock man ill admit it.. i have sear ch ed the forums and hsvent found a thread yet with all four carbs squirting out of that passage hole.. darnit!! Also i can squirt carb cleaner into the main jet, and it will squirt freely out of that passageway. Shouldnt the slide needle seat and not allow any fluid past?
 
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Hold the floats up to your ear in a dead quiet room and shake them rather vigorously...... This will allow you to HEAR even small amounts splashing around in them. How much actual clearance is there between the floats and the gaskets??? You can trim the gaskets back to the edge of the bowl chambers with a utility knife to eliminate any doubts about them.
 
Also, work the floats up and down with the bowls off and visually see that the float needles are not binding. They should drop and there should be no felt binding or resistance as you lift the floats. If they do, then look at the float hinges right in line with the posts and youll see a tab bent up That tab controls how far the floats can drop. Adjust that tab so you get good smooth action from the needles.

If you dont see the tab with the floats mounted they are probably upside down.
 
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chuck hahn said:
Also, work the floats up and down with the bowls off and visually see that the float needles are not binding. They should drop and there should be no felt binding or resistance as you lift the floats. If they do, then look at the float hinges right in line with the posts and youll see a tab bent up That tab controls how far the floats can drop. Adjust that tab so you get good smooth action from the needles.

If you dont see the tab with the floats mounted they are probably upside down.
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That is a fantastic idea!!!!!! I will try this in the morning!!! Darnit i wish i would have seen this before i left the garage.. that would explain the extreme amount of gas commi ng out.. i also did not put the circlip that goes around the brass that holds the needle from comming out. For 1) it only had 3, and For 2) they were interfering with the floats resting on the needle.. Ill check that tomorrow along with the adjusti ng tab!!!!!! Your a genius thank you
 
Jitsufighter said:
That is a fantastic idea!!!!!! I will try this in the morning!!! Darnit i wish i would have seen this before i left the garage.. that would explain the extreme amount of gas commi ng out.. i also did not put the circlip that goes around the brass that holds the needle from comming out. For 1) it only had 3, and For 2) they were interfering with the floats resting on the needle.. Ill check that tomorrow along with the adjusti ng tab!!!!!! Your a genius thank you
Click to expand...

Also for the sake of not making a mistake... are these upside down?
 

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Also i submerged them for a few minutes and really tried shaking then in all directions for a while and couldn't hear a thing. And basically its like.. fuel on, 3 seconds, carbs shooting fuel everywhere. Its deff. Like the needles are stuck
 
Cant tell from that picture. Just look at the brass flat hinge the pin goes thru and look for a little tab bent at a 90 degree angle and thats in line with the post. And seeing that those are composite floats in the picture you certainly do not have weighted down floats.
 
Heres the tab. If you dont see that they are most likely upside down. Set the tab so the needles move smoothly. The tab in the center is tweeked up or down to set the float hts.


s-l1600.jpg
 
chuck hahn said:
Heres the tab. If you dont see that they are most likely upside down. Set the tab so the needles move smoothly. The tab in the center is tweeked up or down to set the float hts.


s-l1600.jpg
Click to expand...

Ok so..... i set the float opening tab ... re installed the 3 circlips that hold the needle in place and... nothing.. ran out the tubes like before.... i think i may raise the floats to an extreme ammount to see if it will **** the fuel flow off. Any other tests you think i could try?
 
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