My boat has been running very poorly at lower rpms and shutting off intermittently. So I pulled my carbs off and gave them a thorough cleaning, including replacing all the gaskets, orings, floaters, etc inside. I counted the turns of the idle screws when removing them from the motor and installed them back in the same respect...but I'm idling at 1500 RPMs now. Granted, this is on muffs, so I'm going to stick it in the water today to try and adjust further....but last night I couldn't seem to alter the idle by adjusting the screws counter-clockwise. I'll have to wait until I get home to post a pic of the screw I'm adjusting, but it's on the side of all 3 carbs and is located pretty close to where the linkage connects to the bodies. First carb rebuild, but I had a guy at work that does his own maintenance give me a brief run-down and he stated that was the idle screw. Good news, my motor is running like a champ now! I'm hoping it continues to run well once I get my idle back down to 900 RPMs Motor is a Tohatsu M40D2, 2005.