JohnnySCV
Seaman
- Joined
- Jun 24, 2008
- Messages
- 71
Hi folks. Here is the story... I have a 1999 Champion 203 (20' 3") with a Mercury 225 EFI of the same year. The engine is mounted to a Hydro Jackplate, the prop is a Stainless Steel Trophy 4 blade 25 pitch prop I believe it is a 13-3/4” Diameter. My problem is right as the boat gets on plan the engine revs, and seems as if the prop just spins in the water, I think that is what you refer to as cavitation. I have lowered and raised the engine via the jackplate. It seemed to get a little better as when I lowered it but it still cavitates. I really have to lay off the gas to keep it from happening. The prop is in great shape by the way. Not kicks, dents or anything like that. One person mentioned to me it could be the exhaust causing the cavitation. Another theory is the prop either small in diameter or I need a higher pitch... maybe both.... Your thoughts?