So me and my friend went to go fourwheeler riding one day I started the quad it fired on first turn and ran perfect never sounded better drove it on the trailer get to the park and it would not start at all spent hours only way to get it to even back fire was to put hand over carb. I checked psi later 90 so I rebuilt top end still wouldn’t start. I replaced stator, recitifier, cdi, coil, its getting spark but still wont fire up I checked crank seals they look new no cracks no leaks no play or loose feeling and I know its pulling in gas because I will put my hand over the carb and itll try sucking in my hand. am I missing something im totally lost. please help thank you