How hard is it to replace the piston rings in an 80's Honda 10hp?

I have a 1980's Honda 10hp, in one cylinder I have 105psi of compression and in the other I have 60 psi of compression. I believe this is greatly effecting the performance of it as it can't get my 12ft zodiac planing at full throttle with more than one person in it. I was wondering how difficult it is to replace the rings in it. I have a two stroke dirtbike so maybe that coil be a scale as to the difficulty? I know that being a four stroke it is more tricky because you have to deal the the timing and all but is it really that much harder?

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