1994 Yamaha 9.9 hp 4-stroke outboard carb

[Dr. David A. Johnson]

Lots of great info on this board. I'm looking for help in adjusting the idle mixture on the carb of my Yamaha 9.9 hp 4-stroke. Is there a separate screw for the idle mixture apart from the idle speed adjust screw? If so, where is it located and what's the proper adjustment method? The outboard presently idles a bit rough, but runs well above 1500 rpm. Can anyone can provide a diagram or email me a pic? Any suggestions and/or assistance are greatly appreciated. Thanks in advance.

 

[JB]

Re: 1994 Yamaha 9.9 hp 4-stroke outboard carb

The carb on the 9.9 Yammy 4 stroke is a nightmare of technology.<br /><br />You must use a manual to troubleshoot or adjust it.<br /><br />Good luck.