I just rebuilt these carbs and reinstalled them. This idle seems rough to me. My boat's tach reads the rpms at around 400 but I'm not sure how accurate that is. I need a better tach for testing. Per manual I started with the idle screws out 1.5 turns from lightly seated. I think I have a misfiring issue, though. Interested in feedback on this idle, out of water, in gear.