I noticed the line on the block of my 130 yamaha and all of these valves are parralel with the line. Do these valves suck oil and fuel and push it thru its own line to the front of the intake and how do you check them? Can you blow into them or pull vaccum only? How do you remove them? Unsrew or pull them out? Thanks I have never fooled with these and want to know if they are working and maybe replace if bad? Thanks