Havent had the intake off and have checked the hoses and fix a few that were cracked. Cant hear a hiss and when sprayed carb cleaner there wasnt a change in the motor. So i dont think that theirs a leak. the choke is open but i have no idea where the fast idle cam is. I have another carb on the 83 i have but honestly the carb look kinda hard to take off with the bolts under the bowl and stuff searched the site for a post on takeing it off but seem that 720's arent that popular . and thank you for takeing the time to help