Greetings I got almost brand new storage trx400 2007 engine is perfect condition, did carb rebuilt due to fuel leaking from float bowl, it stop the leak. Now it is hard to start the atv only will start on choke off and throttle, as soon as I let go of the throttle it dies. Air filter is new spark plug is new battery is new. Any help please thank you. I didn’t change air fuel screw since I don’t have the tool? Can that be a problem?