vacuum line ?
 

New to the little quads, but I have a lt-a50 I pulled the exhaust off to take out the restriction plate(that was already gone lol) but noticed there was a port on top of the motor that looked like it should have a hose connected to it. I google imaged a hose diagram and it says its a vacuum hose that should be there. my ? is where do you tie that vacuum hose into from there? thanks in advance!

It's been way too long but I had the basically the same LT50 for my son when he was 5 (33 now) Had a restrictor plate in the exhaust,plus a second restrictor in the carb,that had a small pilot jet on top of another one that could be removed for more power. If I can remember correctly? if the tube is coming from the engine crank case,it's just a crank case vent that can be vented up on the frame. Others may have a better memory than me...