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Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16206
Experience:  Degree in Marine Technology. Gas and diesel marine mechanic.
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I have a 15 hp 2002 Mercury two cycle outboard experiencing

Customer Question

I have a 15 hp 2002 Mercury two cycle outboard experiencing cavitation when just about to get on plane new prop still exhibits cavitation or reving of engine RPM. Have marked shaft prop and locking nut and no slippage is observed. could this be internal slippage in the lower unit when accelerating ? Is there any other test I can do?
Submitted: 2 years ago.
Category: Boat
Expert:  Jason replied 2 years ago.

Hello my name is ***** ***** am I speaking with?

It's not slipping internally, that won't happen with these lower units. If you marked the shaft and the marks line up then that rules out a slipping prop hub.

What is the story on this engine? What kind of boat is it mounted to? Has it ever worked correctly with the boat the engine is mounted to?