The eccentrics are designed to be paired together but flipped with their centerlines set at 19° from from the “horizon” line.

 

In order to accomplish this accurately for both sides of the engine, I fabricated an aluminum positioning jig with a 5/8″ ground drill rod as a pin.

 

There’s probably a proper mathematical formula out there to figure the angle, but since I’m not a trained “mathlete”, the bottom of the aluminum block was simply milled away little by little and the eccentrics repeatedly test fit with everything resting on a granite surface plate until the eccentric centerlines were at exactly 19º. It works for me.

 

Then the whole assembly was securely positioned in the milling vise to be cross drilled for a roll pin. At this point in the process I was “in the zone” and unfortunately didn’t take any photos of the clamping, drilling, or cross pinning.

 

To set the eccentric position, I removed the upper cylinder head and placed a dial indicator on the piston to find top dead center of the crankshaft while a digital level ensured that engine was perfectly level.

 

Then the pinned eccentrics were slid onto the output shaft and the digital level placed on top of them, resting on a parallel. I rotated the eccentrics ever so slightly until the digital level read zero and then tightened the set screws. The process was repeated for the other side of the engine and now all the eccentrics were in theory, correctly timed to the crankshaft (or pretty darned close).