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Petcock Re-work

  • Thread starter Thread starter JW-GS750E
  • Start date Start date
J

JW-GS750E

Guest
My 81 GS750E has a bad petcock. The internal spacer failed. Are there any issues, besides not being able to shut off the fuel at the petcock, with converting it to a manual mode until I can replace or repair it?

Thanks,
JW-GS750E
 
Forgetting

Forgetting

Yes, forgetting to turn it off every time, may allow gas into crankcase if your floats don't work properly. Other wise you should be OK.
 
habsdoc said:
Yes, forgetting to turn it off every time, may allow gas into crankcase if your floats don't work properly. Other wise you should be OK.
Click to expand...

sorry thread hyjack... I just went to look at the oil in my bike and it was full of fuel?? could this be a bad petcock?
 
cheers thanks i was worried i was going to have to do a carb rebuild! I will tak e off the petcock and check it out. thanks
 
Yeah its in the plans but this is salvaged bike from the scrap heap.. glad it is a simple thing to start with as i have a few spare petcocks! I dont have a spare carb rebuild kit! just to make sure though the carb floats sticking wont cause the case to fill up? I havent really got the bike to start yet and i dont want to run it with gas in the case. im hoping that i can use my other tank on it and run it. Then i can begin the process of tuning it up!
 
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You do not need and should not use a carb rebuild kit. They use poor quality components. What you need is an oring kit from cycleorings.com.
When you get to it, of course.
 
koolaid_kid said:
You do not need and should not use a carb rebuild kit. They use poor quality components. What you need is an oring kit from cycleorings.com.
When you get to it, of course.
Click to expand...

So just rebuil with what i have aye?? CAnt i just get o-rings to match? I just read through the carb rebuild and it looks like a piece of cake! I just need to find some Carb dip???? that works or maybe an alternate??
 
gs750caferacer said:
I dont have a spare carb rebuild kit! just to make sure though the carb floats sticking wont cause the case to fill up?
Click to expand...

Not if the petcock is shutting off the fuel completely. The floats can leak all they want, there won't be any fuel to leak if there is none coming through the petcock.
 
True that makes sense. Everyone says buy new petcocks... Is there no way to rebuild them? What anout an in line ball valve or something to make double sure these accidents dont continue...
 
Not sure about your 1981 750 but on most of them you can usually make an off position with a little effort.
 
Are meaning little effort like a vise grips on the hose.. Lol its a sinking ship with tge way it leaks...
 
People have tried to rebuild them but most end up failing again very quickly. There a lot of articles on here about their attempts but yours could end up differently. Do a search by clicking on Search, Advanced Search, Select Titles Only, and use petcock rebuild for your search terms.
 
gs750caferacer said:
Are meaning little effort like a vise grips on the hose.. Lol its a sinking ship with tge way it leaks...
Click to expand...

Not sure about your '81, but on the older GSes, you can do it like this:

Remove the steel ring with the two screws that keeps the lever in place. Inside this ring is a little tip that keeps the lever from going all the way around.
Grind away the steel tip, now the lever can move 360 degrees. Turn it to the new position with the lever straight up, there's your off position. You may have to shorten the lever so it won't hit the tank.

Replace the diaphragm with a piece of inner tube rubber so fuel can't leak down the vacuum line into the carburetor.
 
ummm
people seem to think that exxcessive fuel in the oil is only caused by a bad petcock. well that is only one of the problems. Fuel should NOT flow into the motor with petcock on and engine off.


The float needles and seats are worn/dirty if this happens.

positively shutting off fuel at the petcock will of course solve the problem, but it should not happen even on PRIME if left overnite if the floats and needles are good.

I've left many a bikes with GAS LEFT ON even for months and never had a problem with oil in the gas UNLESS the floats/ needles/seats are bad!

I think they designed auto shut off petcocks like ours to fend off leaking carbs and give it more time till that nasty thing happens thats all.

On my old suzuki savage I wanted rid of the original petcock because after sitting over winter, the gas evaporated from the carbs and the prime mechanism was torn out of the petcock cause it was all messed up so I always had a time starting it after it sat a while!!

there was a very nice fix of putting on a yamaha raptor manual petcock on it!!! It fit perfecly and was only 30 buck as I remember..I wonder if anyone has tried that on our GSs???
 
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I've left my bikes in prime, and sure enough the carbs overflowed, the bikes were on the sidestand.
I did it again recently on my GS1100E but this time the bike was on the centerstand, the carbs did not overflow.
I don't know why they do that, but perhaps you should check your owners manual.
Here's a '82 750EX owners manual that states on a caution that leaving the petcock on "Prime" may cause your carbs to overflow, this is on page 16. So.................. it doesn't specifically say that you got bad seats or anything else wrong with the bike, it just says doing that may cause them to overflow. I think the fact that when my bikes were on the sidestand the floats were not level and maybe didn't fill completely to allow the seats to close completely. Anyway, for what it's worth here's the owners manual.
http://www.mtsac.edu/~cliff/storage/gs/GS750EX_Owners_Manual.pdf
 
I will admit that on the side stand there will be more problems.. . i suppose more so on
GS models too...for whatever reason(s) possibly floats not floating??
but all things being the same..............


If you have good needles/seats/floats... it should not happen
 
Well my bike has a worn out side stand and no center stand anymore ( PO took it off god knows why) on the side stand it leans way over, Im guessing that it may play a part in it.

I agree that the needles and seats must be worn a for it to leak the way it has done... Its flushed the tank dry! (never have I seen a bike do that before and I have left the prime on heaps of times with no problems!

Ive been looking at getting an ultrasonic cleaner so if i get one... Then that might be a perfect excuse to Rebuild some carbs!

Although I really want to just get this bike going as cheaply as possible so i can use it before summer is over!! buwahhh
 
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