Originally Posted by SavageBlunts904
I just found a decent deal in town for a BGF engine and its not labeled at all and neither was the instructions for how big the bore is. It seems to look the same size on the outside as my 48cc Skyhawk but im not sure. Is there any way to figure out the size without taking the head off of the motor?
Push a kind of ruler without sharp edges into the exhaust. Less than 70mm should be a <50cc engine.
I hope that helps.