At 1999 it will be a merc powerhead. Good engines and reliable. They did suffer with the problem of the water tube grommet being crushed by corrosion. Not a huge job to sort and would suggest doing the mod if it hasn't already been done. Other than that they were a good engine. Pretty bulletproof. Basically the same as the 2cyl 25, 3cyl 40 and 4cyl 50. Gearboxes are common to plenty of models and again are no trouble.
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