Buying aboat that needs a new enginecan be agood situation if the boat is priced to reflect the cost of repowering. The problem can be that the actual cost can be a lot more than expected. For example it cost about $6000 for the engine rebuild of a Westerbeke 35hp diesel. Pulling the engine, re-installed, added another $5000. While the engine is out is also the time to do new hoses, alternator, cooling, etc. geting the engine project to about $13,000. If you find anything else like fuel tank, steering etc. that may need work, this is the time to do it, and before you know it the engine rebuild has run over $20,000.
Certified...in several regards...