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  #1  
Old 09-04-2011, 03:07 PM
Greene Greene is offline
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Default 23 classic repower with Yamaha F300

In July my ox66 250hp blew two cylinders and therefore a repower was in order. I repowered with one of the new Yamaha F300 offshore series. This thing only weighs 560 lbs.

My initial impression, AWESOME! The digital controls are very cool and the motor is very quiet at idle, though it is more throaty than a F250 at cruising speeds. The new numbers are also impressive. I only have 5 hours on the motor but here are some initial numbers.

35 mph @ 4000 RPMs getting 2.6-2.7 mpg. I can stay on plane at 3600 RPMs.

WOT was 48-49 mph @ 5800 RPMs burning 1.7 mpg.

At idle, 600 RPMs, fuel burn is 0.6-0.7 GPH.

My guess is the fuel ecomony at midrange will slightly improve once the motor is fully broken in.

The old



In with the new



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Old 09-04-2011, 03:28 PM
Basspond Basspond is offline
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Those are really good numbers so far. I think a lot of 23 owners are looking at the F300 for future repowers.
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Old 09-05-2011, 07:26 AM
Greene Greene is offline
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The command link gauges are really nice too. Lots of additional space in the console without the oil tank too.
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Old 09-05-2011, 08:16 AM
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FDHog FDHog is offline
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Hey Greene
I have the same power on my 2011 23FS. My numbers are close to yours.
I'm getting a max of 5700 rpms at 47mph, 33mph at 4000 rpms with 2.6 mpg.
Do you have a painted bottom, and what prop are you running?
You seem to be getting a few more rpms than me.
I have a 15.5 X 17 3 blade SWSII.
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Old 09-05-2011, 08:45 AM
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My prop is a no-name stainless 17p. I would like to try a mercury enertia 17p.

I do have bottom paint.
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Old 09-05-2011, 08:59 AM
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Quote:
Originally Posted by Greene View Post
My prop is a no-name stainless 17p. I would like to try a mercury enertia 17p.

I do have bottom paint.
Thanks
Figures are close. This motor is a great match for this boat, but the 23 rides so good, I just want to go faster.
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Old 09-05-2011, 09:47 AM
Greene Greene is offline
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FDhog-

I looked at the yamaha performance bulletin and it looks like I'm doing a bit better, though you are right in line. Now, it could be that I have a classic, which is 200 lbs or so lighter than the FS models. I also opted to have the dealer mount on the motor on the 2nd mounting hole instead of 1st (like in the yamaha test and how it comes from the regulator factory). This does decrease the drag, if only a little bit. Those two things could account for the small differences in performance
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Old 09-05-2011, 02:27 PM
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I'm not complaining. I'm extremely happy with the performance, it's just that coming over from a Triton 2690WA, which had no where near the ride and handling the 23FS has at speed, I'm hooked on going faster.
This boat is an absolute pleasure to drive. Just have to get used to the slow speed tracking of a single vs. twins.
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Old 09-07-2011, 10:37 AM
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Greene, what did the new 300 cost?
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Old 09-07-2011, 03:24 PM
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John, I think I saw his post on THT as $27K installed w gauges and controls
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