Fast Fred's Secrets of the OMC MOD50's Thread #1

[Fast Fred]

ok, take your pistons ( it's easyer to finger port the cyl before you bore it when
doin it by hand, make sure pin location is the same on new piston, the new bore
job will clean it up) old ones, after checkin pin location, and mark as shown.

[Fast Fred]

more like the one on the right side, take your time, get it lined up nice nice.
then reload on the rod, full deal, ( cee clips, you want them like the letter C, if thay have tails, cut them off, but not short)
no rings

[Fast Fred]

i'll shoot some more tommrow, every body with me this far ?

[Fastjeff57]

Read through all 32 pages and saved nearly every photo. (I and am at the bottom of the learning curve on these motors.)

A (dumb) question or two:

1. Did the 56 cubers come with two barrel carbs, and is that what constitutes a 70 hp engine?

2. What is the approximate weight of a 49 cube power head?

3. What is the driveshaft like (diameter, number of splines, etc.)?

Thanks,

Jeff the Learner

[Mark75H]

The powerhead weighs approximately 110 pounds without the flywheel (a little more than my 60ci inline 6)

I'd have to go down stairs and measure a driveshaft end, maybe take a pic to make it clearer

[Mark75H]

The driveshaft is about 5/8

The top of the driveshaft looks like this, 4 shallow splines

[Fastjeff57]

Yikes! It's a porker! My back would not allow me to tote that monster around, so... Back to the Merc 500, I guess. (It weighs 130 lbs, complete--heavy but managable.)

Thanks again,

Jeff

[Fast Fred]

they did try at the factory on the 56, mod 50 front 1/2, long rods, finger ports , the works. it never made as much Power as the 49 cuber.
ya 110lbs seems about right,

[Fast Fred]

ok, so then ya want to put the crank in, ever so nicely set it in, ketch the three pins,

[Fast Fred]

and check to see that she is lined up,
hear like so,

seated hear

and hear

she should spin like butter