I started RC with an OS 40 ABC FSR with the bolt on front case still runs fine today and it has been 20 years. New bearings after a little storage rust but great compression. Pulled a Golberg Eagle on floats with good authority for years. My instructor set the low end once and I never touched it again. One click of high end ocassionally for weather changes. starts with hand flips on third flip most all the time. We always ran 10% nitro in those days.