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where are the a/f screws on a 1977 gs750

  • Thread starter Thread starter tc862011
  • Start date Start date
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tc862011

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havent been on here in forever. but i have been doing some work to my buddys 77 gs750 and i know where the fuel screws are on the bottom of the carbs but there isnt any adjustment screws on the side of the carbs. i know some carbs have caps covering them and you have to drill into them to remove them to gain access to adjust them. but i have drill more then a 1/8th of an inch and there is just more metal, does this model not have these adjustment screws.
 
yea where it shows where the air screw is there is nothing there, and i dont want to keep drilling and go through the carb, it is just solid aluminum
 
tc862011 said:
yea where it shows where the air screw is there is nothing there, and i dont want to keep drilling and go through the carb, it is just solid aluminum
Click to expand...

keep drilling what??????????? you shouldn't be drilling anything!

post up a pic of the carbs and we will point them out to you......

(have you tried looking on the opposite side of the carb?)
 
some carbs have a cap that cover the air screw that you have to drill into to pull the cap off, but these carbs have no air screws on it i have never seen this, i have checked both sides of the carbs and nothing but solidd aluminum
 
i know where the air screws usually are on these carbs cause it would be the same spot on my gs550 but there isnt any screws there
 
where the cap would be covering the air screws on the side of the carb look at the pic the first answer was and thats where the air screw should be and where i drill in a little to see of there was a cap that was covering the air screws that the factory sometimes puts there to stop people from adjusting it
 
I get that. We need an actual picture because you say there is no cap but you say you are drilling where the cap would be. So either theres a cap or you have a big problem.

It should be obvious without drilling that the cap is a cap.
 
picture.php
i stopped drilling lol i am uploading a pic now, i didnt drill much and the pic is a pic of an untouched one that is supposed to have an air screw but there isnt one
 
I hope i'm wrong but that almost looks filled in. A PO/PM could have replaced the cap with some JB or Qwik
 
thats what i thought but there isnt anything there. he has been riding it for a few years and it runs good but i was doing maintenence and i figure it needed some tuning but it only has the fuel screws and no air screws.
 
its not filled in my hand cause they are all identical like a machine did it, if it was hand filled it would look alot different on each one
 
tc862011 said:
havent been on here in forever. but i have been doing some work to my buddys 77 gs750 and i know where the fuel screws are on the bottom of the carbs but there isnt any adjustment screws on the side of the carbs. i know some carbs have caps covering them and you have to drill into them to remove them to gain access to adjust them. but i have drill more then a 1/8th of an inch and there is just more metal, does this model not have these adjustment screws.
Click to expand...

I think they are there, packed in under JB. How to undo that......hell
 
its not any kind of jb or quick weld cause the one i tested was all straight aluminum
 
they are mikuni carbs and look identical to the ones on my 550 exepct they are on a 750 and are missing the air screws
 
were some carbs made with out these air screws, i have never seen any
 
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