Idle Adjustment Screw

[Aerocraft1994]

I have a 2004 Yamaha V150TLRC. It recently started to idle low to the point of stalling. Out of the three carbs there is only one idle mixture adjustment screw on the middle carburetor. There is also a screw on the linkage that can increase or decrease the idle but doesn't mess with the mixture. I have checked manuals and all the ones I have read the carbs all have two idle screws per. I soaked carbs and then blew them out with compressed air. After assembly it ran better but the idle mixture screw does nothing. Which screw should I adjust. The linkage one does make the idle go up but I dont want to be adjusting wrong.

 

[boscoe99]

One idle mixture screw per carburetor. Two per carburetor pair.

There could very well be a plug that has to be removed to gain access to the mixture screws.

 

[boscoe99]

 

[Aerocraft1994]

I will have to check under the plugs