update on 18 cat repower

Nuaticocat

Cadet
Joined
Sep 1, 2012
Messages
27
Earlier this year I had posted the question of what engine to repower my boat with. Thought I would update.
I have a 2000 Nautico catamaran 18 that had a 50 Honda 4 stroke. Cruised at 16mph, top end of 22 mph.
I went with a 2014 Yamaha F70 . Weight is about the same. With the new motor, cruise is about 26 mph at 4800rpm and wot is 34 mph at 6000rpm. 13 pitch yamaha 3 blade prop. No ventilation issues, ran 6 hours on a 10 gallon tank of 89 octane. Max hp for this boat is 75.
Excellent results so far, this engine was made for this boat!. I had a poor experience with the dealer, but the motor is great. The dealer told me that I can run this motor wide open forever. They did such a sloppy job on install that I wonder if it is true. Anybody?

thanks
 

pckeen

Commander
Joined
Jun 20, 2012
Messages
2,067
Re: update on 18 cat repower

Sweet, glad to hear of the performance change. With that setup, your boat may outlast you!

You can run the motor wide open, but you'll use 50% more gas, and it will be harder on your engine. Personally, I would run at cruising speed.
 
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