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Mercury 250 Pro XS V8 4stroke #12790974 06/13/18 10:11 PM
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ZX4545 Offline OP
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I had a new motor delivered today (Mercury 250 Pro XS V8 4stroke).

I am running a 2015 NiTRO Z8 with a 2015 250 OPTI Pro XS currently with a Fury 25 prop. Will my new prop transfer over with the same performance, or will I need to
re-prop the Mercury 250 Pro XS V8 4stroke?


Last edited by mrm4545; 06/13/18 10:33 PM.
Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12791324 06/14/18 03:21 AM
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grout-scout Online Sleepy
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The v8 runs at a higher rpm, so most likely you will have to drop 1 or 2 inches in pitch. Id run what you have first and once its broken in, you will know better what pitch to drop too.

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12791421 06/14/18 05:51 AM
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They both have 1.75:1 gear rations and only a 200 rpm difference on top end so you should be ok.

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12792533 06/15/18 03:00 AM
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Rpm range on that motor 5600 -6200 just have to make sure DemandLinear witch is requested handle position this should be at 100 % at WOT. then DemandLinear with Guardian -this tells you that that engine is not in Guardian should be 100 % at WOT then one other is Demand - this is the final demand value requested by the software. If the boat is propped correctly this should be at 100 % with the engine speed at 100 % I haven't got to run one yet but the days of just throwing a prop on one is gone. To check all of these readings engine has to be connected to diagnostic software G3 Have the dealer that is installing the engine take the boat to the lake and make sure all of these setting are correct. Your prop would be a best prop to start with.......OPTI

Last edited by OPTI; 06/15/18 03:03 AM.
Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12793267 06/15/18 06:48 PM
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I appreciate the insight from everyone - install tomorrow morning

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12795544 06/18/18 12:33 AM
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I saw some videos where the 250 Pro XS came with a 23 Fury that seemed a little too low in pitch. So a 25 Fury might be perfect. Here is the video.


Last edited by Tex5000; 06/18/18 12:37 AM.
Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12796095 06/18/18 03:50 PM
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Install hit a small snag (don't they always). The new Pro XS has the electrical harness connection moved from the front to the back of the motor, therefore an extension harness is required (and not sent with the new motor). Ordered today.

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12796943 06/19/18 12:55 AM
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Originally Posted By: mrm4545
Install hit a small snag (don't they always). The new Pro XS has the electrical harness connection moved from the front to the back of the motor, therefore an extension harness is required (and not sent with the new motor). Ordered today.


Odd, its been stated on bbc that the clean power harness is included. Sounds like merc made way too many options this time.

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12799266 06/20/18 04:36 PM
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Extension harness received and install resumed - hope to be on the water this afternoon

Re: Mercury 250 Pro XS V8 4stroke [Re: ZX4545] #12803125 06/23/18 10:54 PM
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Please let us how it did when you get a chance.

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