I need help!

[7981GS]

It is dark out and the bike is dirty but, it has worked for 17+ years.









Eric

[TheCafeKid]

Will try that, looking for a throttle valve slide for my bike is been pretty dam tough. Emailed 8 places so far.

If you have 26s I may have a spare slide...

Is it possible that the carbs weren't put back together in the gangplank correctly??

[tucker8541]

I believe the carbs are VM26SS

[tucker8541]

Tapped into the manifold and ran a tube to the petcock and it worked! Very gratefull 7981GS! Works and runs great! But, I have a small problem though. After I shut down the bike and let it sit for a little bit, the #3 carb starts to drip some gas? I have tried to move the petcock lever to on/prime and even reserve. Yet it starts to leak a little? Does the bike need some time for the needle to seat or something? Leak is coming from the filter.

Cafe kid, if the throttle slide is for a VM26SS I would love to rebuild my stock carbs and get them in. I will throw you some cash or do a pimp deal. Let me know...

[7981GS]

I would say that both your petcock anf the float needle are leaking.
More likely than not, it is just the O-ring that goes around the seat assembly that is leaking there but, your petcock still needs to be replaced.

Eric

[tucker8541]

Looks like the needle needed some time to seat. No more leaks so far...

Thanks for all your help guys, still looking to rebuild they other carbs. Do you think I should sell the other extra set? May want to keep them since they are so rare to find parts for. Will post a pic soon, bike is done. Just have to pull it all apart again to get it ready for paint a powder coat.

[7981GS]

I would still test that petcock.
Hook a hose to the vacuum port on the petcock and add suction to it. No gasoline should come out.
And, dump an entire can (15oz.) of Berryman's B-12 liquid carb cleaner into a full tank of fuel. (available at MaoMart and O'Rielly's for about $3.00)

Eric

[TheCafeKid]

It would be for a VM26 for sure. Lemme see what I can dig up

[tucker8541]

Let me know what you want for it, gonna do the rebuild and get them on. Thanks brother

[tucker8541]

Yep, carbs are leaking again, only leaks when the bike is on it's kick stand tilted to the side. 3 and 4 carbs are leaking opposite of the bike being tilted. When the bike is on it's center stand no leaks. I am thinking the floats or float needle. Will try and check the petcock if the floats and needles are good.

[tucker8541]

Ok, I pulled the carbs off and noticed the #4 float was low. Took it off and the float had gas in it. I got the gas out of the float and soldiered the hole in the float, all good no leaks. Adj all the floats a little higher than OEM suggestions from the GS750 manual (Being it's a GS1000 carb). Leaks are gone now!!! Since I had the bottom off the carbs off I changed out the 140 jets to a 110 jet size. Still loses a little around 6500-7200 rpm rather than 5500rpm, should of gone to 100 on the jets. I also noticed the #4 needle was rubbing againts the slide in the carb and so I centered it so the valve moves freely. It didn't go all the way down and seat. Thanks for the help and suggestions...

Anyway, I am rebuilding my stock OEM carbs and going with 100 jet size on them. Rechecked the float high and they are good. Just need a Throttle Valve! Cafe Kid hook me up!

Have to order a new single or a set of needles. Needle reads 5f21, looked them up on flebay and their seems to be differents ones (5f21-1, 2 3). Which ones are they for a 77?

Also, should I move the clip at the bottom and 1 shim/washer, or should I add more? Let me know what you think? Thanks again...

[tucker8541]

Any idea what needle {5F21(b, c, d?)} goes on my 1977 GS750? I want to replace my needles in my carb but when I search for them, it seems to have different types listed for 5F21? Any help? Thanks