Mercury 250 Optimax Pro XS true HP

[stogie]

I have had a couple of folks tell me the true HP is closer to 275.

Any truth in that?

[EuropeanAM]

2005 model averaged about 274 at the propshaft.

2006-> models average about 268 at the propshaft.

[echoXLT]

Just curious, what is a 300xs at the propshaft?

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by echoXLT &raquo;</td></tr><tr><td class="quote">Just curious, what is a 300xs at the propshaft?</td></tr></table>

Good question- my dyno won't handle it.

According to what I've been told- 304-310hp range (average).

[stogie]

Thanks Don, mine is a 2007 so about the same as 2006?

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by stogie &raquo;</td></tr><tr><td class="quote">Thanks Don, mine is a 2007 so about the same as 2006?</td></tr></table>

2006-&gt; means "2006 and up models". So yes.... you're correct.

[abassjihad]

Any idea how much a 225 optimax pumps out? thanks

[transamz9]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by EuropeanAM &raquo;</td></tr><tr><td class="quote">2005 model averaged about 274 at the propshaft.

2006-&gt; models average about 268 at the propshaft.

</td></tr></table>

Don, is it basically in the computer or is it something else? Six HP is quite a bit of of difference in the same rated motor. JMO

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by transamz9 &raquo;</td></tr><tr><td class="quote">

Don, is it basically in the computer or is it something else? Six HP is quite a bit of of difference in the same rated motor. JMO </td></tr></table>

BOTH. In 2006, the engine was reconfigured to run on 87 octane fuel (and that is when the change occurred).

2005 and earlier models of the 250 XS required HIGH TEST fuel.

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by abassjihad &raquo;</td></tr><tr><td class="quote">Any idea how much a 225 optimax pumps out? thanks</td></tr></table>

Approximately 230-235

[Jonathan Holland]

just bought a 2005 250xs and was curious on what kind of fuel I was supposed to run

[JAZII]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by jonathanholland07 &raquo;</td></tr><tr><td class="quote">just bought a 2005 250xs and was curious on what kind of fuel I was supposed to run</td></tr></table>
Post your serial # for the best results.
JAZII

[Jonathan Holland]

serial # ot998513

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by jonathanholland07 &raquo;</td></tr><tr><td class="quote">just bought a 2005 250xs and was curious on what kind of fuel I was supposed to run</td></tr></table>

For serial number: 0T998513, you should be running HIGH TEST FUEL (91 octane MINIMUM).

For more information regarding this engine and recommendations, see the following post (and sections pertinent to your engine):


http://www.bbcboards.net/zerothread?id=310172

[mpino]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by EuropeanAM &raquo;</td></tr><tr><td class="quote">2005 model averaged about 274 at the propshaft.

2006-&gt; models average about 268 at the propshaft.

</td></tr></table>

can you comment on the 2012 200hp pro xs

[EuropeanAM]

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by mpino &raquo;</td></tr><tr><td class="quote">

can you comment on the 2012 200hp pro xs </td></tr></table>

Averages 217-219 at the propshaft.

[rangervx]

interesting...i would have guessed that the HP at the prop would have been less than the HP rating on the cowl...could you tell me what my 2003 225 EFI turns...round about??? thanks...

[Ranger519VS]

BIA standards are that a motor must be rated HP +/- 10%. Manufacturers shoot for the high side of rating for bragging rights in OB on the water head to head tests. The standard was changed to rating at the prop over 10 years ago and it is much easier to prove because anyone can hook prop shaft to a dyno.

[ddantidwell]

hey Don what about my 2002 250 proxb???????

[EuropeanAM]

Don't have the specs on the 225 EFI, but it was on the strong side of the 10% margin.

The 250XB's that I've seen tested were in the low VERY close to the 10% margin (274+)