Has anyone ever seen these little holes on top of the intake blocks on a vitos 392 cub cylinder? I just found out my compression was 122 in left cyl and 90 psi in right cyl. It was running lean I'm wondering if this could be why?? They don't seem to go all the way thru almost like it's a casting flaw but pissin me off regardless! I'm trying to find the tools to do a leak down test not sure where to get a pump and attachments to screw into,the spark plug hole.