I picked my wife up an old 82’ Yamaha Maxim. It will only idle with the choke on, as soon as you kill the choke it dies and as soon as you give it any gas it dies. I’m guessing it’s the carbs. I took the air filter off and shot some carb cleaner spray up into the 2 intakes with it running and managed to get it to rev up a bit but then it started shooting this nasty looking brown crap that smells like gas out of the hole below and centered between the two intakes when it revs. Is there any way to fix this thing without totally taking the carbs off? Any suggestions if I do have to take them off? I cleaned out the tank and checked the petcock and they’re both clean. It did sit for at least a year before I bought it. Also if anyone has a service manual for this thing on the computer that I could get off of them I haven’t had time to order one yet.