OMC 115 questions all you gurus

[tsubaki]

Stink, I'm at a loss there. That don't appear original from what I'm used to seeing.
I hope FERM sees this and can enlighten us.
My best guess is the powerhead is not the original one and that is a part number.
The 85-140 horse take the same block, I'm guessing the "85" portion is just the 4 cylinder designation not 85 horse, the "R" is for remanufactured and the rest might be the serial number.

[tsubaki]

FERM, I was slow posting.
Are any of my thoughts possible?

[Stinky_Hooker]

Have I stumped THE FERM?!?!

[THEFERMANATOR]

Originally Posted by Stinky_Hooker

Have I stumped THE FERM?!?!

not really, I just don't have the books to decipher that code(I've yet to find a dealer that has it either). I would say it's a really late 80's 115HP engine. It has the bubble back exhaust on it which would make it either an earlier 135-140HP powerhead rated engine, or a mid to late 80's propshaft rated 115HP. I believe the later 15's came with the 140 porting, bubbleback exhaust, and other goodies, but had teh smaller 115 carbs to help keep fuel gulping down a little. Only way to know for sure is o pull the airbox and measure the throats of the carbs(I believe they should be 1 5/16", earlier 140's had 1 3/8" carbs). It's the same basic engine as the 85, but the bubble back exhaust flows quite a bit better and the 110+ had slightly differrent porting to them for the extra HP.

[Stinky_Hooker]