Home › Forum › Ask A Member › Advice please re purchase of 1958 7.5hp Johnson › Reply To: Advice please re purchase of 1958 7.5hp Johnson
So, you bought the 7.5hp, correct? If so, recheck the compression. The gage may be inaccurate, but it does show a 10PSI difference which needs to be investigated. Does it show signs of being overheated? It sparks on both cylinders, so must have had ignition work at some point, so may have been run light on oil…. Have a look at the gear lube, then consider pulling the head/intake covers/perhaps the exhaust cover for a closer look….Skip the exhaust cover removal if the engine has been used in salt water, don’t want all the screws snapping off on you. Pull the powerhead for the water pump job, have a look at the lower seal pieces, could mean trouble if they are missing/mixed up….
Post some pictures if you can….D