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Idle Air Adjustment Screw - initial setting

  • Thread starter Thread starter pdqford
  • Start date Start date
P

pdqford

Guest
My carbs (BS32s, Id# 45400, 1980 GS 750ET) have seen the dip and are all reassembled. When I drilled and removed the little aluminum covers over the IIAS (Idle Air Adjustment Screws) I recorded where they were set from the factory.

Carb #1's IAAS was open 1.25 turns.
Carb #2's IAAS was open 1.75 turns.
Carb #3's IAAS was open 0.25 turns.
Carb #4's IAAS was open 1.00 turns.

I was just wondering if I should initially set them to where they were originally set, or should I start out with all of them open like maybe 1.25 turns. What do you carb guru's think?
 
NOT a carb guru...But the generall consensus is to set them 2 turns out. Some like 2.5 but I start with 2 and then fine tune from there...
 
DynoJet kits say to start at 1 turn then fine tune..........its O.K. to have them all set just a little different as you noted from factory adjustment.....however, I'm a little concerned about that one being only .25!!! Maybe you were off a little?
 
TheCafeKid said:
NOT a carb guru...But the generall consensus is to set them 2 turns out. Some like 2.5 but I start with 2 and then fine tune from there...
Click to expand...

I'm with Josh here, 2 - 2.5 turn out. It's just a starting point, adjust them for the highest idle after everything is sorted out.
 
Colorado85gs550 said:
DynoJet kits say to start at 1 turn then fine tune..........its O.K. to have them all set just a little different as you noted from factory adjustment.....however, I'm a little concerned about that one being only .25!!! Maybe you were off a little?
Click to expand...
MY dynojet kit actually says 2.5 turns out to start. I dunno if its different per kit, but thats odd if yours says 1 turn out. Thats pretty lean...
 
TheCafeKid said:
MY dynojet kit actually says 2.5 turns out to start. I dunno if its different per kit, but thats odd if yours says 1 turn out. Thats pretty lean...
Click to expand...


I was thinking the same thing.......so I went to 2 and its idling weird now. When I twist the wic fast, it hangs and doesn't return to idle right away. My bike is going in to the shop in the next couple of days to see what's wrong with it.

It did run with 1 turn each......probably due to me being at 8000 feet!
 
Colorado85gs550 said:
I was thinking the same thing.......so I went to 2 and its idling weird now. When I twist the wic fast, it hangs and doesn't return to idle right away. My bike is going in to the shop in the next couple of days to see what's wrong with it.

It did run with 1 turn each......probably due to me being at 8000 feet!
Click to expand...

Did you replace the intake boot O-rings?
 
Nessism said:
Did you replace the intake boot O-rings?
Click to expand...


No I didn't :o.........after reassembly I did the spray down the boots along the mounting flanges to check for leaks with WD40 and it didn't run up/down at all so I assumed that the O-rings aren't leaking by.......do you think the O-rings are bad and that is causing this problem?:(
 
Colorado85gs550 said:
...however, I'm a little concerned about that one being only .25!!! Maybe you were off a little?
Click to expand...
Yeah, I was surprised at that one too, so I double checked it before taking the screw out.

Thanks for all the feedback, guys. I guess I'll set them all the same and go from there.
 
Colorado85gs550 said:
No I didn't :o.........after reassembly I did the spray down the boots along the mounting flanges to check for leaks with WD40 and it didn't run up/down at all so I assumed that the O-rings aren't leaking by.......do you think the O-rings are bad and that is causing this problem?:(
Click to expand...

Very likely.
 
so where do I buy intake o-rings? is there a supplier here on The GS Resources?
 
Macmatic said:
I can send you a set if you want but I won't be where they are until probably the middle of next week.

/\/\ac
Click to expand...


/\/\ac,

YOU DA MAN!!! How much do you need shipped to 80809? PayPal or Money Order?
 
Colorado85gs550 said:
/\/\ac,

YOU DA MAN!!! How much do you need shipped to 80809? PayPal or Money Order?
Click to expand...

They are on me, just PM your address and I'll send them out when I get back to NY. It will be probably two weeks before you get them though, in case you want to get them sooner.

/\/\ac
 
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