Cal 25 power upgrade - SailNet Community
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post #1 of 3 Old 08-14-2013 Thread Starter
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Cal 25 power upgrade

I'm currently running a Johnson 9.9 2 stroke and it gives me all the power I need but for a number of reasons I'm thinking of upgrading to a 4 stroke. Noise and fuel efficiency mainly. Looking at the Tohatsu/Nissan motors and I'm wondering if I should stay with a 9.9 or drop back to an 8 horse. I mainly use the motor only to get in and out of my marina but I'm planning on taking a long trip down the Barge Canal next year. I want electric start and a charging system.

Thank for your opinions!

Cal 25
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post #2 of 3 Old 08-14-2013
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Re: Cal 25 power upgrade

The Tohatsu/Nissan 8hp motor isn't available in a 25" shaft, so I'd use that as a reason to move up to the 9.8.

The 9.8 with the 25" shaft comes with a special higher thrust prop that is designed for sailboat use. It is a good motor. There is a 2 year old one on the Catalina 25 that I crew with, and it's been perfectly reliable with just regular 6 month oil changes. This is the specific model to get:
Tohatsu 9.8hp Four-Stroke Outboard Model # MFS9.8A3EFUL

The 8hp and 9.8hp motors appear to mostly be the same hardware too, they have the same weight and very similar specs.

I have often wondered how the 6hp Sail Pro would do on a boat like a Cal 25 or Catalina 25. They are a lot less expensive and lighter, both of which would be really nice. You give up electric start, but they still have the alternator.
Tohatsu 6hp Four-Stroke Outboard Model # MFS6CSPROUL

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post #3 of 3 Old 12-18-2013
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Re: Cal 25 power upgrade

For what its worth, I think a 9.8 may be a bit over-powered for a Cal 25. I currently have an older 2-stroke Mercury 7.5 on my cal, and it has plenty of power in open water to put the boat up to 7.5 mph (or hull speed +/-) where the stern starts to sink and it pushes water up front. I usually back it off of full throttle a bit when cruising to 6-6.5 mph or so to get better efficiency (and less noise).

I've been thinking of re-powering myself next year, and hadn't really settled on a model yet. Definitely don't want to give up the electric start, its the best feature on my current Mercury. Good luck!
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