Hey guys, got my eye on a 1957 10hp Johnson QD-18. Been reading some of the more recent and past post on these series of motors. A lot good information supplied.
My biggest concern is compression numbers for this series.
What is consider excellent, good, ok, and no way?
The reason I like to ask you guys is because is because not all motors are the same and compression values vary with series and hp of motor.
Example: compression for the 9.5hp Sportwin series because of the low impact starter is 60 to 80's compression is considered ok to good.(that is my general understanding)
Any suggestions about compression numbers for QD-18 or any other advice would be awesome to get.
Appreciate any suggestion guys!