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carb issue or maybe pitcock

  • Thread starter Thread starter 1980gs1100l
  • Start date Start date
1

1980gs1100l

Guest
Once again been fighting carb problems since i got the bike previous owner installed 4into1 exhaust and pod filters i worked slacking off i might add on totally tearing the carbs apart and orderinng the dyno jet kit finally had to do it bought a set of carbs already set up with the dyno jet kit so i rebuilt the original carb installed the dynojet kit and installed on bike thats where i am now.
Here is the problem my pitcock doesnt prime anymore but i can pull the vac line off the carb and put a vacuum on it and if flows fuel thats how i got the bowls to fill up upon doin this i noticced i had fuel running out of #3 carb fired bike up ran decent took it out for a ride and it seemed after it heated up it got kink of sloppy between 2-3k to a roll on full throttle it hesitated could this be a float prob that i may have not set properly
Also after i park the bike overnight it is kind of hard to start hit and miss like its not getting fuel i can pull a vacuum and it will fire up and run could this be a pitcock issue or both thanks
 
Hi,

I noticed that this had slipped to the second page with no responses.

If your petcock does not flow when set to PRIME, then it has a problem. The fact that you have to apply a vacuum manually (perhaps more than is supplied by the motor) means that the petcock has a problem. I would recommend buying a new one so that you can forget about it for the next 20 years.

The flat spot in your power band can probably be solved by a little carb tuning, like shimming the needles. I'm not a carb expert. But hopefully with this little bump one of them will come along with some better ideas. ;)


Thank you for your indulgence,

BassCliff
 
As BassCliff mentioned, SCRAP your petcock and get a new one, END OF STORY. ;)

As for the flat spot between 2k-3k it could be a few things:

1) have you synced the carbs yet (not a bench sync but the real carbtune or similar sync)?
2) as it is low on the RPM range, it may be the primary circuit(s) are still slightly plugged.
3) since you have the jet kit in it...does it pull hard AFTER the 3K range?
4) if Yes to #3, then as mentioned, you may have to shim the jet needles unless you installed a set with the notches in which case the #3 notch (middle) is a good place to start.
5) also if YES to #3, it is not likely your float settings.
6) are ALL the o-rings new?
7) where are the mixture screws set?
 
Last edited:
my mixture screws are set at 4 rounds out from lightly seated needles mere changed with the kit thanks
 
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