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I need help!

  • Thread starter Thread starter tucker8541
  • Start date Start date
Looks like the needle needed some time to seat. No more leaks so far...:D

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

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...
 
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
 
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