Welcome to the seadoo forum Chrisg. On the carburetors the screw with the pin through it is the low speed adjustment. It should be set at 1 1/2 turns and adjusted in 1/4 turns increments for adjustment. The high speed screw has a plastic cap on it and is set at "0". The plastic cap allows it to be adjusted to no more than 1/4 turn in either direction. To adjust the idle use the idle adjustment screw and not the low speed screw to adjust the idle. Be sure both carbs are in sync and the oil injection cable and the throttle is in sync with each other.
I hope this helps.
Karl