Those small motors are a breeze to work on. Replacing or rebuilding carb, maybe a fuel pump, filter, and water pump are easy.
I've presently got a 9.9 88 model year Yamaha I picked up many years ago for $300 and I've replaced the carb because of a cracked bowl. I also changed the reed valves and put a 15 hp carb on to convert it to 15 horses since there was little difference between the price of carberators, and everything else in the motor was the same.
I've had a few small motors and they'll last a lifetime if you just do minimal maintainace, and keep fuel stabilizer in the tank.
Look for Chilton's type repair book for your motor and just some common hand tools and you'll be all set.
Just one more cast!