[Brother]

The little round plug on the top left side of the cylinder head has popped out for the second time (this time while riding, the first was when I was in a parking lot) I honestly have no clue what could cause this??? I thought maybe the crank case breather hose was clogged and it had excess pressure.The first time I checked it, there was no clogging/debris.

Any insight into these engines would be greatly appreciated as this part cant be ordered online as far as I can tell. If someone does know where I can order it, please let me know that too.