When you say it “slips out of gear”, please be a little more specific..
Does it come out of gear and stay out of gear?
Or, does it come out of gear and only go back in when you slow the throttle down?
Or, does it seem to jump in and out of gear, the engine seems to “buck”?
Am hoping you answer is one of the first two, then perhaps your rubber propeller hub is worn and slipping. It is also possible that your shear pin is partially broken. It is also possible that your engine is mounted up too high and the propeller is “ventilating” in the air mixed in with water.
If the engine “bucks”, and goes in and out of gear when it misbehaves, then it is more likely that you have clutch dog issues.. This could have been caused by a cable or shift system adjustment issue, which will have to be investigated as well…
