I found it online and the seller says it is an Airsal kit.However,I can't seem to find any real info on it.It is a big bore 70cc kit for the 2 stroke 50cc engines.It appears that the cylinder bolts to the cases and the head has 6 bolts holding it to the cylinder and is sealed with an o-ring.Have any of you guys run this top end before or know anything about it?