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The Carbs win again. Adjustment Q gs550

  • Thread starter Thread starter NEO
  • Start date Start date
N

NEO

Guest
Well i have everything in order or at least i think.

Both air and fuel screws are 1.75 turns out. No vacuum leaks that i can find.
Upon the rebuild i fabbed up some extended tubes for the vacuum ports off the monifolds so i could get to them easier, and before anyone asks, they are sealed and proper with tight fitting caps/nipples.

When i remove #1 3 or 4 nipple on the tubes idle goes down and almost dies. But #2 would raise the idle considerably. It wasnt until i adjusted the air screw out 4 turns that idle would be affected the same way as the rest when removing the nipple. These are rebuilt slide carbs. It seems to run great this way but it cant be right and SAFE. Any ideas?
 
When you had the carbs apart, did you happen to note whether all the jets matched?

It is not unheard of for a previous owner
cus.gif
to mess up a jet and just grab one that fits, without paying attention to whether it's the correct one.

Any chance you mis-counted the turns on the fuel screw on #2? You might have an extra half-turn, which requires extra air to compensate.

.
 
Steve said:
When you had the carbs apart, did you happen to note whether all the jets matched?

It is not unheard of for a previous owner
cus.gif
to mess up a jet and just grab one that fits, without paying attention to whether it's the correct one.

Any chance you mis-counted the turns on the fuel screw on #2? You might have an extra half-turn, which requires extra air to compensate.

.
Click to expand...

I replaced the jets myself. All the same. The fuel screws are the same. Triple checked them too. I have not vac syncd em as i hav only a single vac gauge, not the one everyone says to buy.
Also having the bike idleing, i have a laser temp meter,and the #2 cylinder shows alot colder until i crank out the air screw. Im thinkin i have a bad carb body or somthing. Only thing i can check or havent changed.
Thanks for the help too guys.
 
Sounds like typical problem of carbs needing to be synced
 
NEO said:
But #2 would raise the idle considerably. It wasnt until i adjusted the air screw out 4 turns that idle would be affected the same way as the rest when removing the nipple. These are rebuilt slide carbs. It seems to run great this way but it cant be right and SAFE. Any ideas?
Click to expand...

Check your vacuum line to the petcock, the petcock it self, and the boot fitting between the carb and the air box. Sounds a little lean on the #2.
 
Dave8338 said:
Check your vacuum line to the petcock, the petcock it self, and the boot fitting between the carb and the air box. Sounds a little lean on the #2.
Click to expand...


No vacuum petcock. Aftermarket tank and petcock. No airboxes.POds. Im sorry i should have siad all this before. Im a horrible gs'r.
 
Number 2 sounds rich, that's why the idle speeds up with the vacuum port uncovered. Maybe the #2 float is sticking some?

And what the others have said about sync…
 
Last edited:
Nessism said:
Number 2 sounds rich, that's why the idle speeds up with the vacuum port uncovered. Maybe the #2 float is sticking some?

And what the others have said about sync?
Click to expand...


I didnt even think about that. Im gonna pull em and check. I need to find someone who could help with the vac sync.
 
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