i have a kfx440, added a fcr40mm carb with uni aluminum airbox, main was 180 pilot 45 mixture screw about2turns out.. after 1 lap at track it cuts out and is hard to start... have to wait like 5-10 mins before it starts and those the same thing.. i went to 190 main no help.. im guessing it gets hot and cuts out but the fan is not coming on(checking that also) can someone please help me out cause it sux.