Connected the vent hose to the bottom of the velocity stack box (I hope I'm using the correct terminology). No other vent hoses that I could find are pinched. I started it up without the air filter cover idling fine. My son ever so gently placed the air filter cover on and revs went to the moon, or tried to until he moved the cover out of the way. I had to trim the video but here it is.
View attachment IMG_1126_Trim.mp4
View attachment IMG_1126_Trim.mp4