New member, new machine. Idle question

Hi I just bought my first machine, 2005 sportsman 500 ho. Previous owner died and it sat for a few years. I was having trouble getting it to accelerate under load. I put a caltric carb on, thinking I’d rebuild the original over the winter and put it back in this summer, but for ice fishing just run the knockoff. It work fine, but the idle speed seems a bit high, at between 1500-1600. The book says it should be 1200. Should I be concerned by this? I did adjust the throttle cable to the replacement carb, so it’s not pulling the throttle open any at idle. I don’t even see an idle speed screw on this carb if I do need to adjust it down… any help is much appreciated!