"Ya they really fly out of there quick If your not careful!!"
That is an UNDERSTATEMENT. Stuff like that has enough force to KILL.
Pumping oil into it with a hand pump would be a LOT safer than compressed air.
Case in point... quite a few years ago we had a trencher with a 12HP Briggs in the shop.
Took the head off and it had a broken rod, with the piston way down in the bore.
I got the BRILLIANT idea to blow compressed air into the crankcase through the breather.
It built up pressure for a few, then, suddenly the piston popped out... straight upwards, past the noses of myself and a helper, hit the foil-faced insulation about 18 feet overhead, and tore a hole in it.
Then, fell down, again right between us, and slammed down on the flywheel shrouding just a few inches from where it took off!
We were darned lucky one of use didn"t get in the face on the way up, or on the head on the way down!
Since then, I don"t use compressed air for such things!