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    115 Pro XS Command Thrust on a pontoon - prop?

    Will try and make this as TLDR friendly as possible. Both props tested same day, same conditions, same load. RPM confirmed via VesselView and speed via GPS. Would like to be able to hit max RPM(6300) or just above with this load as it is about as light as we're ever going to be. Also confused by...
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    Mercury 115 fourstroke high rev low speed

    Yup. I had the same issue with my 2018 115 Pro XS CT. It was missing the prop bore sleeve and would ventilate at about 4000-4200 RPM. Luckily it's only like a $5 part and takes about 5 minutes to install. I ordered extras to keep on hand as it appears very common for them to break. With...
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    Shift Position sensor - 2018 115 Pro XS 4S

    Just past it and no good dealers around. Would rather just handle it on my own.
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    Clogged fuel tank vent cause engine to start and die?

    Having done a bit more research, it appears as my FDV might be the problem.
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    Clogged fuel tank vent cause engine to start and die?

    2018 Mercury 115 Pro XS CT 4 Stroke 2018 pontoon boat with Moeller fuel tank in engine pod. Fuel tank has a raised fill neck with a vent hose attached about 2" down from the fill cap. No primer bulb or FDV, fuel supply hose goes direct to the motor. A few weeks ago it developed a problem where...
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    Mercury Pro XS to MercMonitor Level 1 to Lowrance?

    I was shopping both the MercMonitor gauge and Gateway, ended up finding a killer deal on a MercMonitor Level 1 gauge, so went with that. Either a junction box, or a male to male adapter is needed on the gauge side, as both the gauge side of the engine harness and the gauge harness itself, are...
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    115 Pro XS CT 4 stroke losing RPM and speed

    Yes, but conditions were better than other days when we got better performance out of it.
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    115 Pro XS CT 4 stroke losing RPM and speed

    2017 model, serial #2B501681, bought a couple of months ago on a 22' pontoon boat with lifting strakes and under skinning. 4 key time spans, each consisting of a few times out on it. 1st time out - Wouldn't rev past about 2500. Diagnosed/as a bad shift position sensor, problem solved. Also...
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    UFlex - HYCO vs HYTECH vs PROTECH?

    Just got off of the phone with UFlex, found some interesting tidbits for anyone else looking at their mid line hydraulic systems. The website is outdated and needs to be updated as of this post date. The Hyco 1.0 and Hytech 1.0 are, indeed, the same. The difference is that the Hyco requires...
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    UFlex - HYCO vs HYTECH vs PROTECH?

    Are you saying that the Hyco and Hytech are the same? Why do some product photos say Hyco and some say Hytech on the box? There's also a Hytech 1T that comes with a tilt helm. https://www.defender.com/product.jsp?id=6738677
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    UFlex - HYCO vs HYTECH vs PROTECH?

    Want to upgrade my mechanical steering to hydraulic. Price difference between the Hyco and Protech are similar enough, about a $60-70 dollar difference. Engine is 115 ProXS CT. Boat is a 22' pontoon. Aside from the 150 and 300 HP limits between the 2 systems, would one provide any benefit over...
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    Rebuilding pontoon into a tri-toon

    One thing to consider is that if you boat on any public bodies of water, the coast guard or whatever entity patrols said body of water could have an issue with your boat not having the ratings and capacities sticker, or an engine that surpasses it, regardless of you adding the 3rd toon. Beyond...
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    Mercury Pro XS to MercMonitor Level 1 to Lowrance?

    Alright, how about this? Does this look right?
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    115 Pro XS 4 stroke, is it a CT?

    2017/18 115 Pro XS 4 stroke, serial #2B501861. It has a sticker on the lower that says 2.38:1, which would indicate that it is a Command Thrust lower. However, just about every other CT Pro XS I've seen in person and in photos has a silver lower, while this one is black and it doesn't appear...
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    Mercury Pro XS to MercMonitor Level 1 to Lowrance?

    The MercMonitor can power an NMEA2K network. It seems that all I really need is the following...
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    Mercury Pro XS to MercMonitor Level 1 to Lowrance?

    4 stroke 115 Pro XS CT Level 1 MercMonitor gauge which is also a gateway and the wiring harness for it has an NMEA2000 connector New Lowrance Elite FS 7 I keep being told and reading that I need an NMEA2K network between the MercMonitor and Lowrance - Why is that? Why can't I plug the...
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    2021 mercury 4 stroke 115 not turning over

    Not sure what your problem could've been, but it sounds like you used the hose connection intended to flush the motor out when you ran it at home. This, in theory, should keep the motor cool, but it doesn't lubricate the water pump impeller in the lower unit and you could burn it up. Best to...
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    princecraft pontoon , vectra 21 2015 with 115hp Command thrust prop selection

    Not going to hold my breath based on how little action there is in here...but, we just bought a new to us 2018 Vectra 21 bi-toon with lifting strakes, under skinning and a Merc 115 Pro XS CT 4 stroke. With a 14.5" x 17P prop, our best with a light load was 58-5900 RPM and 25-26 MPH. Max RPM...
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    Yet another prop question thread

    Can you explain why you're suggesting that?
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    Yet another prop question thread

    2018 Mercury 115 Pro XS 4 stroke. 2018 22' pontoon. 14.5" x 17P Solas Rubex 4 blade aluminum prop. WOT top speed with 2 adults, light gear and 3/4 tank of fuel was 26 MPH at 5800 RPM. Should be able to rev it to 6300. What prop should I go with to maximize RPM and gain top end?
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