Join Date: Oct 2006
Location: Green Bay, Wisconsin, USA
Make: GL1500 SE
To answer your question about the 80psi, Adding the atf is making a hydraulic situation which is a brand new ball game, Air will compress as hydraulic oil will not. and you are correct about the valve seats, I have no clue what mother Honda used for their seats, Most automotive seat are made of stelite which are harder than the valve itself. I was just trying to be helpful for him to figure out his low compression on his ride without splitting the case. Just my 2 cents worth, Charlie
The seats are in fact Stellite. The valves are Stellite coated which is why Honda does not like you to grind the valves. You would grind the Stellite off.
Worked on the "big rigs" for 45 years now just riding my Wing whenever I can. Gets cold in Wisconsin.