Reply To: Compression

[Bob Wight]

Both motors should run OK with 80 psi. If the motors have been sitting idle for some time, rings could be slightly stuck and compression might come back up a bit after you run them. My 1958 and 1959 10hp Johnson both run great with about 80 – 85 psi.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."