I just finished breaking in an RZ-VO1B and was curious what P.S.I. I should expect at this time of the motors life. I purchased a Compression Tester and I want to keep track of the P.S.I. along the way. I just don't know what an average base line is to start out with. I know it is more than 60psi., because when I used my old tester, it pegged the needle!!!, so I purchased a 200psi tester! Thanks to all, Mark.