You are quite entertaining at times tkent02.
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1978 gs 750 carbs cleaned now the oil glass gauge looks black and over full.
You are quite entertaining at times tkent02.
Right, Chuck.
The suction comes from the vertical drop, it can be MUCH greater than the tiny drop from the top of the tank to the petcock.
Try to read a little science, it's good stuff. Or at least try what I suggest before you **** all over it.
Better yet, just go back to the greetings.
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try a little common sense...it will get you farther than science.
1 gallon of gasoline equals 5.8 to 6.5 lbs. Depending on ambient air temps. So that being said, 5 gallons X 6.2 ( as a medium value ) equals 31 LBS of collective weight above the petcock which is supposed to hold it back. Now that little itty bit of suction really isnt the over riding factor in a leak as compared to the collective pressure from 5 gallons of gas upstream. Im sure your degree in scientific "theory" will say otherwise though.
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Chuck, are you serious? You really can't figure out how this crap works?
Not only is your math wrong, it's the wrong math.
The volume doesn't matter, the vertical drop does.
Nevermind, I don't get paid to teach kindergarten physics to people who won't learn.
Not only is your math wrong, it's the wrong math.
The volume doesn't matter, the vertical drop does.
Nevermind, I don't get paid to teach kindergarten physics to people who won't learn.
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7981GS
Guest
Yeah should say 31...so i typed that the wee hrs of the morning...so what. Pressure is pressure whether its from gravity forcing from the top or suction. My test will yield the same basic results as yours. I do as a man with 42 years as a mechanic tells me to do..not what some science page on the internet says. He knows more than youve ever forgotten about bikes and especially the GSs.
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Anyone mention the wheel bearings as a spot to check for that wobble???
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MoMakkawi
Guest
well here she is with the new bars on, still not familiar with how to post pics better here. i found sucking through the vacuum tube that way to much gas was coming out.. so i am pretty sure thats the problem for overflowing. I have been searching online for a new petcock and have had no luck. Any one know where i could get a new petcock for my 1978 gs 750..
What do you mean that too much gas is coming out? Its a 1/4 inch hole and its gonna gush out like a fire hose into the bottle. The floats (SET AT THE RIGHT HEIGTHS ) regulate how fast the flow goes thru each carb as each cylinder uses the gas from the bowls. As was stated before..check the float condition, the condition of the seats, and reset the heights on each of the floats in each carb. Have you done all this or just piddled with the petcock and assume thats the culprit? Not trying to bust your balls but you really need to check them.
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MoMakkawi
Guest
i only did just mess with the petcock. tuesday may be the night to check the float heights and make adjustments if needed if that doesn't solve the problem then ill replace the petcock. who knows maybe my dumb@#$ left it on pri and that did it...
Set both sides of the floats and move them up and down to see that they are free and all that. Also, on the ends of the float needles is a little spring loaded thing..be sure its free too. Looks like this. And heres the little raised edge you measure from. Yes these are crappy carbs that i just used to snap an example picture from.
That will do it. the float needles are not really intended to hold back the head pressure in the tank, although the will if everything is really perfect.
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MoMakkawi
Guest
thank you chuck, i figured out the problem the other day, it was the float heights.. i completely messed those up when i rebuilt the carbs but now its running like a dream and no gas into the crankcase... im glad you told me that since i was one click away from purchasing a whole new petcock and spending more of what little money i have. 
Gald it worked out as a time thing only...money well saved.
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