I have a 225 yamaha trimoto that has the automatic transmission. Lately it will not "idle" in gear but will try to engage the drive train. In other words to get moving from a stand still you have to hold up on the gear shifter lever and give some gas then let off...almost like with a manual clutch. Does anyone know the best way to fix this this? The "clutch free play" adjuster screw does nothing. Many thanks!