What parts are interchangeable 90 2.4 racing vs 89. 150 xr4

[Merc 2.5]

Will horn work on 5 petal front?

Mighty good question there. I'm not sure if it will fit a 5 or not .... since all were 7s idk

[nitro_rat]

Mighty good question there. I'm not sure if it will fit a 5 or not .... since all were 7s idk

The horn motors have the injectior bosses in the front 1/2. All horn motors were 7 petal. No 5 petal front 1/2's have injector bosses. The horn should physically bolt on but there wil be nowhere to put the injectors...

There was an injected front 1/2 in the classifieds recently.

[MercRoy]

First two pics are the 2.4 I had previously and last is the front of the racing engine. So my thoughts are this was originally carb engine?

[bullet123]

Thought there was something different

[Merc 2.5]

That's a 5 pedal on "racing " engine. Hard to belive that's a racing 2.4. What's the serial#

[MercRoy]

The five pedal was from a diff engine and I was wondering if I could/should run this on the race 2.4

Number stamped on block is 91c854

[Merc 2.5]

That's not serial, should b welch plug in top block in between heads or where to block halves meet where throttle timin arm goes
And yes that was a carb front half

[MercRoy]

Those are the only numbers I can find on block except for what looks to be a date stamp of 03 12 91
the mid section that came with it has Oc276549 as a serial number but I cannot confirm 100 percent that is the original mid

[Merc 2.5]

With yr being 91. Is there not a plug that looks like freeze out plug on top of block? Usually letter comes 1st in serial

[Merc 2.5]

Well for ****s and giggles. What's the tag on mid

[MercRoy]

Oc276549

[Merc 2.5]

Comes as 90 2.4 carb is block black or "natural color "
Are the heads bolted on it?
03/12/91 is. Consider 90 model

[MercRoy]

Block is bare and heads are missing

[MercRoy]

[bullet123]

Be further ahead to build 2.5