FrankenMercury Need Help identifying what I got...

[skutsch]

Ok so I picked up a bit of a rare bass boat, and it seems to be a pretty good looking hull that has potential to go fast as well as be a pretty good fishing platform. It has a 135 Mercury Black Max on it but when I picked it up the seller said, "I think somebody swapped the powerhead cause its pretty fast" - MAN! Why didn't you say that sooner, I would have bought it much quicker!!! Anyway, so here are the numbers I got off the motor and I am trying to figure out what I have.

Serial Number on the ID Plate (near the transom mounting brackets): 0A957475
Number on the Frost plug on the port side cylinder bank: 5904475
Starboard Heads: 1026-7261
Front of block below the flywheel: 95785
Port Side behind timing advance arm: 030281 (I assume this is the "born on" date)
Starboard Side below the circuit board: 65663
On the block between power packs and heads: 7914 or 7974

It is sitting in not very well lit garage, so I might not have captured all these numbers correct. I do have pictures of all of them that I can post, let me know which number you want to see, and I will throw it up here. Thanks in advance for any help somebody might be able to provide!

[roadkill636]

2.0 liter 150hp early 80s

[skutsch]

Ok - Thanks for the quick reply!!!

[tlwjkw]

tha 0A serial number shows '86 135. don't jive with build date? number on block is '80 150.....

[skutsch]

Yeah, very confusing. Everything external on the motor leads you to believe its a 135 (Cowling, etc) and 1986 was the first year Mercury did a Oil INjected 135, so that all fits with the serial number on the ID plate.

The guy I bought it from said it had a different power head on it and he was pretty sure it was more then 135 HP. So I Roadkill's assessment of a Early's 80's 150HP passes the common sense test (at least what the seller told me) that the power head was upgraded. I just don't know how Roadkill determined it 150HP???

I was just looking at the lower unit, it also is not original, it's an SEI (49291), so this thing truly is a FrankenMerc

[tlwjkw]

fixed my previous post. "short read" your orginal post..............

pic. of port side and either head will tell tha tell 'bout year....

[skutsch]

fixed my previous post. "short read" your orginal post..............

So the block number(s) lead us to 150 - Got it!

[tlwjkw]

5904475 shows first generation 150......

[skutsch]

Port Side (Close)


Port Side Header


Starboard Header Close

[tlwjkw]

build date is right. first gen motor........

[skutsch]

AWESOME! Thanks guys, next step are compression and leak down tests, then we will see where we are at...