Actually, to Seasick's point about maybe having to remove the whole assembly... in this case, I think you just grab a hold of that motor and yank it off by hand!
Given the nice condition of everything else... I'm betting someone already replaced the motor and went with the cheapest of cheap knockoffs thinking "Ah, they're all the same... why pay extra money for a name brand".
But back on point... yes, replace this sooner than later. It's not a bad/hard job. Everywhere I looked when I wanted to remove my whole tilt assembly said you had to lift the motor off because the assembly could only be taken off "forward". After about 10 minutes of insepcting it I gave it a shot by taking it off rearward without lifting the engine. 30 minutes later I had the whole thing off and in my hands.
Obviously I can't say if that will be the case for whatever motor you have, but take a real good look at it and don't trust (this is not meant towards anything Seasick said) what you read online, or sometimes even in a service manual, as verbatim.
That said, with the right setup, it's less than an hour to lift an engine off enough to swing it out of the way enough.
