How to lower idle speed on a 2005 40 hp Johnson?

[polarispete]

Can any here explain to me how to lower the idle speed on my 2005 Johnson 2 stroke outboard? I looked under the engine cover and there are quite a few adjustment screws on the lingages but cannot find one on the carbs themselves.It ildles at around 1200 RPMS which is way to fast to try and troll.The motor is almost new and hasnt been back to the dealer for any adjustments but need to lower the idle just a tad. Thanks in advance.