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Anonymous
Guest
It wont stop flooding out.
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There is a pretty good chance your floats are sunk.....in fuel.
If the petcock is on PRIme, then fuel will run freely to the carbs, but the purpose of the floats/needle valves is to stop it from running into the carbs as overflow.
You have to open the carbs and check the float position, and see if there is dirt holding the needles from seating. You may need new needles/seats, but first check for dirt. The dirt would likely come from the tank, via the fuel......instal an in-line fuel filter....you should have one anyway.
If the petcock is on PRIme, then fuel will run freely to the carbs, but the purpose of the floats/needle valves is to stop it from running into the carbs as overflow.
You have to open the carbs and check the float position, and see if there is dirt holding the needles from seating. You may need new needles/seats, but first check for dirt. The dirt would likely come from the tank, via the fuel......instal an in-line fuel filter....you should have one anyway.
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Anonymous
Guest
Flooding GS750t
Flooding GS750t
Thanks ,I have checked the fuel cock and it is working properly and the carbs are clean.The floats are dry and the float neddles seem to be clean. I also have a clean tank/gas and a new fuel filter.Do you think it needs new neddle seats?
Flooding GS750t
Thanks ,I have checked the fuel cock and it is working properly and the carbs are clean.The floats are dry and the float neddles seem to be clean. I also have a clean tank/gas and a new fuel filter.Do you think it needs new neddle seats?
Re: Flooding GS750t
Re: Flooding GS750t
You may need new needle seats but I would make one more check before buying them. If the seat tabs for the carb floats are bent too far down (relative to when the carbs are right side up, its possible the float is floating to the top of the bowl before the tab engages the shut off/needle seat. Turn the carbs upside down, remove all bowls, and set the float heights to (I believe its 21 to 23 mm) for your model bike. Put the bowls back on and check for fuel overflow again. That may stop it.
Earl
Re: Flooding GS750t
You may need new needle seats but I would make one more check before buying them. If the seat tabs for the carb floats are bent too far down (relative to when the carbs are right side up, its possible the float is floating to the top of the bowl before the tab engages the shut off/needle seat. Turn the carbs upside down, remove all bowls, and set the float heights to (I believe its 21 to 23 mm) for your model bike. Put the bowls back on and check for fuel overflow again. That may stop it.
Earl
zentar said:
S
SqDancerLynn1
Guest
You need to physically remove the needles, clean them and exanine them for any grouves that would keep them from seating
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Anonymous
Guest
Also check O-rings at needle valves
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Anonymous
Guest
Re: Help!!! My GS750t is flooding out and nothing stops it.
Re: Help!!! My GS750t is flooding out and nothing stops it.
I'm no expert, but I know a lot of these problems can be traced to petcocks that are NOT working great! My '81 bike would start with clean plugs, then would begin to run poorly, then would stall out - all the fault of a bad vacuum petcock. If you have a vacuum petcock, as I suspect, perhaps the vacuum diaphram is bad. In my case, I diagnosed the problem by pinching shut the vacuum line from the petcock to my number two intake runner, then took the bike for a ride with the petcock set at "prime". Problem solved! You'd probably notice the number two spark plug sooting up or being wet/gummy - somehow looking significantly different than its neighbours. (If this is a carb problem, it's unlikely they're all bad unless the floats are incorrectly set. You need to check the condition of all the spark plugs and let us know how they look - is their condition different cylinder to cylinder?) I replaced the old petcock and all has been well for more than a year. By the way, ensure that you haven't ended up with fuel in your crankcase. Watch for any significant increase in your oil level.
Good luck.
Re: Help!!! My GS750t is flooding out and nothing stops it.
zentar said:
I'm no expert, but I know a lot of these problems can be traced to petcocks that are NOT working great! My '81 bike would start with clean plugs, then would begin to run poorly, then would stall out - all the fault of a bad vacuum petcock. If you have a vacuum petcock, as I suspect, perhaps the vacuum diaphram is bad. In my case, I diagnosed the problem by pinching shut the vacuum line from the petcock to my number two intake runner, then took the bike for a ride with the petcock set at "prime". Problem solved! You'd probably notice the number two spark plug sooting up or being wet/gummy - somehow looking significantly different than its neighbours. (If this is a carb problem, it's unlikely they're all bad unless the floats are incorrectly set. You need to check the condition of all the spark plugs and let us know how they look - is their condition different cylinder to cylinder?) I replaced the old petcock and all has been well for more than a year. By the way, ensure that you haven't ended up with fuel in your crankcase. Watch for any significant increase in your oil level.
Good luck.
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Anonymous
Guest
Reply to checking plugs/vacume
Reply to checking plugs/vacume
Al, thanks for the advise.Its hard to tell any difference in the plugs because their new and all seem to be dry but the bike has only run for about 15 min. since I put a new stator in it.It does seem to run good when you first take off but after it warms up and I ride it down the street it still floods out and gas starts leaking out of the breather box drain.Ive checked the fuelcok and it works in the on position whe the bike is running,so I quess the vacume is working properly.I have keep a close eye on the oil and havent noticed any gas leakage into it. When I cleaned the carbs they appeared to look fine and I checked the floats by the specs. and I was kinda unsure where to do the measurement from. I know it should be 23 mm. from the bottom of the carb to the float. I knew that when i bought this bike that it had a short and that it run great 1 year ago but it has really suprised me that even after cleaning the tank/carbs and fixing the short that It still floods out.My son races MX so I worked on his 2 stroke alot(even new topend between races)and have never had something stump me like this.HELP!!!!!!!
Reply to checking plugs/vacume
Al, thanks for the advise.Its hard to tell any difference in the plugs because their new and all seem to be dry but the bike has only run for about 15 min. since I put a new stator in it.It does seem to run good when you first take off but after it warms up and I ride it down the street it still floods out and gas starts leaking out of the breather box drain.Ive checked the fuelcok and it works in the on position whe the bike is running,so I quess the vacume is working properly.I have keep a close eye on the oil and havent noticed any gas leakage into it. When I cleaned the carbs they appeared to look fine and I checked the floats by the specs. and I was kinda unsure where to do the measurement from. I know it should be 23 mm. from the bottom of the carb to the float. I knew that when i bought this bike that it had a short and that it run great 1 year ago but it has really suprised me that even after cleaning the tank/carbs and fixing the short that It still floods out.My son races MX so I worked on his 2 stroke alot(even new topend between races)and have never had something stump me like this.HELP!!!!!!!
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Anonymous
Guest
Re: Reply to checking plugs/vacume
Re: Reply to checking plugs/vacume
Im confused about your description of the symptoms. Heres why
You said its hard to read the plucs because they have not been in long enough. If you are flooding the plugs will get dark the forst time it happens..Ill bet you have a problem other than flooding
Re: Reply to checking plugs/vacume
zentar said:
Im confused about your description of the symptoms. Heres why
You said its hard to read the plucs because they have not been in long enough. If you are flooding the plugs will get dark the forst time it happens..Ill bet you have a problem other than flooding
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Anonymous
Guest
Re: Reply to checking plugs/vacume
Re: Reply to checking plugs/vacume
Maybe a problem in addition to flooding. We still have to get past that fuel dripping from the airbox. Of course, all four stroke plugs look clean to guys with two stroke experience!
Re: Reply to checking plugs/vacume
slopoke said:
Maybe a problem in addition to flooding. We still have to get past that fuel dripping from the airbox. Of course, all four stroke plugs look clean to guys with two stroke experience!
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Anonymous
Guest
Flooding out
Flooding out
I did forget to add that when I take the carbs off and turn them over to take the bowls off that there is always 2 carbs. that have fuel in them and the other 2 appear to be dry.This may be nothing but just in case.Ill pull the plugs and look at them again when I get off work.I dont have much time to work on it because I work 24 hr. shifts and a part time job that also keeps me busy along with 2 very time demanding kids.Iam by no means a mechanic but I have done alot of shade tree work on motorcycles and lawnmowers and this is the first one that I cant figure out. Mabey I should bight the bullet and take it to the shop and shell out a couple hundred bucks.I do appreciate all the advice that everyone has given.Ill try one more time before I take that drastic measure.Ill let everyone know how it goes,It will be Wensday before I have a chance to work on it again.
Flooding out
I did forget to add that when I take the carbs off and turn them over to take the bowls off that there is always 2 carbs. that have fuel in them and the other 2 appear to be dry.This may be nothing but just in case.Ill pull the plugs and look at them again when I get off work.I dont have much time to work on it because I work 24 hr. shifts and a part time job that also keeps me busy along with 2 very time demanding kids.Iam by no means a mechanic but I have done alot of shade tree work on motorcycles and lawnmowers and this is the first one that I cant figure out. Mabey I should bight the bullet and take it to the shop and shell out a couple hundred bucks.I do appreciate all the advice that everyone has given.Ill try one more time before I take that drastic measure.Ill let everyone know how it goes,It will be Wensday before I have a chance to work on it again.
M
moto_dan
Guest
Another thought...what condition were the rubber plugs covering the pilot jets when you had the carbs apart? If they leak and or missing this may be a contributing factor and as someone else mentioned the o-rings around the needle seat. Items #39, 50 at the following link.
http://bikebandit.com/partsbandit/showschematic.asp?dept_id=144055
http://bikebandit.com/partsbandit/showschematic.asp?dept_id=144055
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Anonymous
Guest
Flooding problems
Flooding problems
After reading that last response It was brought to my attention that when I cleaned the carbs I did not remove the cover(all 4 are in place) and did not clean the pilot jets.Could that cause #3 and#4 to flood out.My wife removed the plugs and carbs today while Iam at work and she said that #3 and #4 plugs were darker than #1 and#2 and she also said that when she turned the carbs over and pulled the bowls off that the matching carbs were full of gas and the other 2 once again seemed dry.Do you think that could be the cause of it flooding in those two carbs?
Flooding problems
After reading that last response It was brought to my attention that when I cleaned the carbs I did not remove the cover(all 4 are in place) and did not clean the pilot jets.Could that cause #3 and#4 to flood out.My wife removed the plugs and carbs today while Iam at work and she said that #3 and #4 plugs were darker than #1 and#2 and she also said that when she turned the carbs over and pulled the bowls off that the matching carbs were full of gas and the other 2 once again seemed dry.Do you think that could be the cause of it flooding in those two carbs?
M
moto_dan
Guest
Re: Flooding problems
Re: Flooding problems
It really sounds like your carbs need a thorough cleaning. My suggestion would be to follow the carb cleanup guide from the homepage of this site http://www.thegsresources.com/gs_carbrebuild.htm and replace all the o-rings that can be purchased form robert barr at the following link http://home.att.net/~robert.barr/ Set your carbs per specs reassemble, then if you still have problems we'll go from there. Don't give up there's enough cumulative expertise represented in this forum to repair anything. Good luck.
Re: Flooding problems
zentar said:
It really sounds like your carbs need a thorough cleaning. My suggestion would be to follow the carb cleanup guide from the homepage of this site http://www.thegsresources.com/gs_carbrebuild.htm and replace all the o-rings that can be purchased form robert barr at the following link http://home.att.net/~robert.barr/ Set your carbs per specs reassemble, then if you still have problems we'll go from there. Don't give up there's enough cumulative expertise represented in this forum to repair anything. Good luck.
B
Billy Ricks
Guest
zentar said:
The pilot jets being dirty will not cause flooding, if anything it would cause a lean condition at idle. You either have bad float needles, incorrect float heighth, or the o-rings on the float needle seats are leaking. The o-ring wraps around the needle valve and they dry out and shrink with age. You can also shave off a bit off it reinstalling them if they are not oiled. You can easily have fuel seeping around them.
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Anonymous
Guest
I had the same problem.
I had the same problem.
I kept having the same problem even after totaly rebuilding and dipping my carbs. It was not till I rebuilt the petcock that it stoped over flowing into the air box. Im glad I have rebuilt the carbs, and the petcock. If I had it to do over I would have done all that from the start. I bet I had the carbs off 7 or 8 times. I was intimidated by the thought of not being able to figure out how to get the carbs back together. Once I took a salvage set appart though I realized how simple it is. The salvage set helped me alot in figuring out how to do mine without breaking anything. + when I did break a float stem I was able to rob one off of the junk set and drill and tap it on with a screw.
The next time I get into another older bike I will do the carbs, petcock, and intake boot O rings all from the start.
I had the same problem.
I kept having the same problem even after totaly rebuilding and dipping my carbs. It was not till I rebuilt the petcock that it stoped over flowing into the air box. Im glad I have rebuilt the carbs, and the petcock. If I had it to do over I would have done all that from the start. I bet I had the carbs off 7 or 8 times. I was intimidated by the thought of not being able to figure out how to get the carbs back together. Once I took a salvage set appart though I realized how simple it is. The salvage set helped me alot in figuring out how to do mine without breaking anything. + when I did break a float stem I was able to rob one off of the junk set and drill and tap it on with a screw.
The next time I get into another older bike I will do the carbs, petcock, and intake boot O rings all from the start.
L
lhanscom
Guest
Billy Ricks said:
My carbs have been overflowing while the bike has been sitting, and I know the petcock was faulty, and have hopefully fixed. However, in order to get the carbs to overflow something has to be wrong with the carbs too, I think mine may have the o-ring problem, but have no idea where to get a replacement. Do you have to get the whole assembly, or can you just replace the o-ring? Also, now that the petcock is fixed, is it even an issue having the o-ring seep a little? I would think it would be a small enough amount so that the engine at idle would burn enough gas so it wouldn't matter. Is that true? Thanks.
M
moto_dan
Guest
lhanscom said:
robert barr has o-ring sets very reasonable at http://home.att.net/~robert.barr/ Slight seeping while engine is running would probably not be a major concern. Others may provide further info.
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Anonymous
Guest
lhanscom said:
I replaced my petcock, but did nothing further pending a more pressing need to pull the carbs apart. The carbs had been professionally cleaned (by someone I really trust) and necessary o-rings replaced soon before the petcock failed. Even so, it was clear that some seepage was occurring when the petcock went bad. As you stated, any one idling cylinder surely uses more fuel than the one drop each 45 seconds that flowed from my airbox (engine off) before the new petcock. I can't imagine that something as volatile as gasoline wouldn't seep to some small extent at the best of times given the imperfect conditions that the needles and seats are exposed to.
Even supposing that the entire contents of the shortish fuel line downstream from the petcock were to find its way into my crankcase on each cooldown, my recent reading about aircraft engines leads me to believe this wouldn't be the end of the world ('plane engine crankcases are routinely fed raw fuel to thin the oil at startup, even in warmish climates - the fuel boils off through the engine breather as the engine warms).
Finally, moto_dan provided a link earlier in this posting-string for new o-rings (I've got my new set handy in case the carbs have to come apart). I regularly see new pattern-parts needle/seat/o-ring sets for Suzuki on Ebay at popular prices, but I don't know what is available for your model.
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Anonymous
Guest
Carb Flooding
Carb Flooding
I've read all the replies posted so far and all seem good advice to me. The only thing I would like to add is that when this happened on my 1977 GS750 the culprit was Rust coming from the petrol tank. I tried cleaning everything but the final solution was to get the tank overhauled Inside and Outside -- since then all is OK
Carb Flooding
I've read all the replies posted so far and all seem good advice to me. The only thing I would like to add is that when this happened on my 1977 GS750 the culprit was Rust coming from the petrol tank. I tried cleaning everything but the final solution was to get the tank overhauled Inside and Outside -- since then all is OK