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Discussion Starter · #1 ·
Hello all, can someone tell me where i can find the air mixture screw on a Mikuni BDSR39 carb?
I have a 2005 Hyuosung GV 650 with a pair of these carbs and its running way rich and rough idle and popping exhaust, id like to try the factory 2 and a half turns out and go from there but don't have any diagrams on where the air mixture screw is on the model.
If anyone can point me in the right direction or if you have pics even better.
Thanks in advance
Marty :)
 

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I don't know exactly what carbs SV has but they're 39mm Mikunis for sure so likely same carbs.

On almost all carbs idle mixture screw is on bottom, near float bowl.
 

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Same carbs as used for SV. Here's a pic of the bottom of the carb, fourth photo from top of page. The screw is centered just below the two upper float bowl mounting screws that are circled.
 

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note that from the factory there may be a plug over it
 

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Discussion Starter · #6 ·
note that from the factory there may be a plug over it
I think you are right cause i cant find the screw, there is so much hardware connecting both carbs together that i cant see the wood for the trees....ha ha ha.
I might have to put it in the shop to be done.
Thanks all.
Help much appreciated.
 

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use a small drill bit and drill through the cap. go slow because you don't want to chew up the head of the fuel screw itself.
 
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