Mercury s/n ?????

**Mercman80** · 04-29-2019, 07:23 PM

Can I tell what Mercury block I have by the numbers in the plug on top of the block?
It has a big "W" and then B291874
only ones I can find ..

**vnemous** · 04-29-2019, 08:09 PM

Mercury 200 xl 1987 2.4l

**Mercman80** · 04-29-2019, 08:19 PM

Originally Posted by vnemous

Mercury 200 xl 1987 2.4l

Thank you for the info ....so that should not have been an efi horn motor? ..like it is now ..someones frankenmerc ?

**Mercman80** · 04-29-2019, 09:53 PM

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**Merc 2.5** · 05-01-2019, 06:47 PM

Sure looks like a legit bp

**Wayne Cammidge** · 05-02-2019, 11:55 AM

On the Race part catalogue
0B290... is starting serial number for a model for the 2.4 EFI
So it is possible to be a legit motor.
Mercury's serial numbers are consecutive of what they produced, but their production line could switch backwards and forwards between models quite randomly.
I do not know of a public site where, we the dealers can look up exactly what a serial number, was model wise.
It probably exists somewhere, but I have never come across it

**Merc 2.5** · 05-02-2019, 03:11 PM

After looking it up its sayin 88 2.4 200 carbed motor ? Weird

**Wayne Cammidge** · 05-03-2019, 01:03 AM

The look up charts only really tell you the year

**vnemous** · 05-03-2019, 05:59 AM

I ran the serial number thru Mercnet since we are a Mercury dealer

**HStream1** · 05-03-2019, 06:28 AM

200

1988

xl

b241881 - c100861

**tlwjkw** · 05-03-2019, 07:32 AM

hp efi "oval port"...…… justa naked 200 block from hi perf.

**Wayne Cammidge** · 05-03-2019, 09:34 AM

They did not make 60 000 odd 200 XL motors in 1988.
????

**tlwjkw** · 05-03-2019, 09:58 AM

don't know 60,000 but do know they built both bp and op (unpainted production block, usually identified, but like merc does, not always with a "200" stamped in one of tha welsh plugs) hi perf in carb and efi in '87/'88….. not an "odd" motor..

**FUJIMO** · 05-03-2019, 10:09 AM

**tlwjkw** · 05-03-2019, 10:17 AM

what makes it "unique" number comes up as a "production" number (in lieu of a "hi perf" designation) which most 200 "hi perf op's " will ina normal hunt... tha "naked block" but a "production number" is tha dead giveaway...