Hint----You can NOT find a broken / damaged / stuck open reed valve with a compression tester.
Well I sure hope its not the reeds! That looks to warrant a total rebuild, once your in that far! Is it possible to inspect them with a snake camera?
Hint----You can NOT find a broken / damaged / stuck open reed valve with a compression tester.
Sure ----one of those camara thingies will work.-----Removing carburetors makes it easier.-----But do a thorough trouble shooting job first.----Outboards are so simple that they will fool you!