Hello everyone I am new to the forum. I am working a Suzuki King Quad 300 4X4 for a family member and I am dealing with several issues. First the atv has been in storage for several years. I had to buy a used fuel petcock for it and install it. It works great and the fuel pump is pumping fuel just fine. The atv has great spark no issues there. I pulled the carb off initially and cleaned it. The problem I am having is the King Quad is hard to start. I put in a new battery and it would take at least 2-3 minutes to start! Once I got it running it ran fine. Yesterday I removed the carb again and cleaned everything again and it is worse now. I had to turn the idle screw in the whole way for it to idle. Now it won't start or run unless I take the boot off between the carb and air box. And when you hit the top end of the throttle range it smokes really bad. I checked the intake boot and it does have some cracks in it but I sprayed starter fluid around it and nothing happened? I am not sure if the cracked intake boot would cause the carb to no operate properly or not? I tore the carb completely apart and cleaned all of the jets, air jets and made sure all carb passages were completely cleaned. I adjust the air/fuel mixture screw out 1.5 turns and tried it at 2 turns it didn't seen to make a difference in operation. I tried several times to reinstall the boot between the air box and carb and it shuts off immediately every time. I checked the air box, screen, and air intake tube for any obstructions and I did not find anything. I checked the choke function and it is working properly. I also double checked the jet placement and made sure I didn't switch the choke and main jet, no problems there. So I am at a lose now and need help desperately. I did check the air filter it is fine too. A local motorcycle mechanic said the intake boot has to be the culprit but before buying another one I need to find out if anyone else has suggestions on the matter. Thanks in advance for all of your help!