Rotate the flywheel until the piston is just past top dead center and on it’s down stroke. Insert a wood dowel or screwdriver thru the spark plug hole and push in on the piston. If the wrist pins or rod bushings are worn, you will feel the free play and hear the clunk. A tiny bit of play is probably OK but a big clunk will let you know the engine needs some big work.
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."
