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I'm also interested in how you make out as I have the same situation with a 2009 275 Tournament.

I'd be curious too as I have the single F350. How about upgrading the F350 to 425 with the Nizpro tune? If I didn't have a warranty...

I had this quick connect installed when I repowered this year. Its a little more convenient but I noticed water doesn't come out the telltale hole when I use it, I hope there is enough pressure?

I just sold my 2007 1st generation F350 with 1100 hours and am putting a brand new F350C on my 275 this week. I should have some good comparison data on speed and fuel economy to share. Long story on how I got the motor but it was a leftover manufactured in 2017 that was still in its crate and...

I have a 275 with a single F350 and would say the narrow beam is a plus for its length in rougher conditions. The hull has a deep and relatively sharp forefoot that helps reduce pounding and the moderate deadrise allows a lower planing speed. You may not be going as fast as a 24 degree deadrise...

I see about the same cruise/gph. I had a prop shop add some cup which gave me a little better performance at cruise. Overall I've been happy with it, I just updated all the electronics this summer, 60+ hours so far this season.

Sorry for the delay, worked out fine with the reconditioned OEM prop but top speed with bottom paint and half load is only 41 mph. With a F350C I would think a few more mph than the F350A I'm running.

If the 255 deluxe helm seat is the same as the 275 there is one on ebay: https://www.ebay.com/itm/193476319254

Well I took it to my marina and they could see the low voltage code which they cleared but couldn't replicate the issue. I ran it today for over an hour (split between batt 1&2) and had 14 volts the whole time. Back to square 1. I am going to keep my meter with me and, if it happens again...

Looking at wiring chart in manual, I can't see any ground other than the green fuel ground, does that mean the ground is on the engine?

I think you are right, the motor restarts because the battery still has enough charge, if I were to press on withe the low voltage warnings I believe the battery would simply run down. Haven't seen this ground stud yet, it must be a bit hidden, will follow neg cables.

I can shut motor off and restart no issues, cranks fine but it's immediately flashing low voltage.

Looking for some help with a charging issue. 2009 Tournament 275 with single F350 and two battery switch set up. Both batteries have been load tested and check out. I only use 1 battery at a time (ie go out on battery 1, come back on battery 2, etc). At idle speed no issues at all, seeing 14.1...

So my Powertech LFS4 came before I could move the engine up and I tried it out. Incredible difference, now stays on plane down to 3300 rpm with no tab whatsoever and better MPG up to ~4400 rpm. Above that, the extra blade takes a toll, went from 44.5 with the Eco to 40 with the LFS4. As I care...

Not sure if 5bars is a lot or not, could mean my engine can be mounted higher but I think its hard to compare bars across models and engine types.

The bilge is dry as a bone, and the livewell and fish box are empty so not a lot of extra weight in the back. I will be moving the engine up a hole this week.

Yes, I'm sure and yes, it is confusing! The SWS XL in the April 2007 yamaha bulletin test is 16.25" in diameter and 19" pitch. That is what you will see in the pdf on the Yamaha site performance archive. The grady site shows the prop as 16.25" diameter 17" pitch SDS for the same April 2007 test...

I sea trialed the boat with the original prop (same as in the yamaha test, SWS XL 19"), and saw 42 MPH at 6100 rpm compared to the 44.5 at 5800 with the eco. The original prop was not in great shape with some dings and scratches which, combined with the low top end, is what prompted the switch...

After talking with Ken and looking at the AV plate I'm going to raise the engine up a hole. Anyone with a single F350 on a 275 ever try this? The top mounting hole would move form the 3rd to the 4th hole from top. I'm also going to try a Powertech LFS4 to see how it does vs. the Eco.

Re: Express 305 prop advice-all 300 Marlin and 305 Express o Sounds like a good improvement, how much more rpm did you pick up at wot?