73 115hp Johnson OB all 4 pistons have 118to123 compressions lower unit has no metal on magnets. Sound is only there when boat is in water and in forwarder or rev I believe I spun out my prop could this be the knock. Motor has the same pick up and run just like it did before the knocking sounds...
73 115hp johnson OB all 4 pistons have 118to123 compressions lower unit has no metal on magnents sound is only there when boat is in water and gos away when at full throttle i am anewbie at this so i have read alot of stuff on knocking sounds but still lost thank alot for the help
