I did mine without the tool, just used a hot air gun to heat up the cases. Drifted out the hollow dowel at the front of the cases & then the cases separted with gentle persuasion on the shafts from the generator side with a plastic faced mallet. I was going to be rebuilding the crank on mine (big end failed) so was not bothered about altering the side play. But with the cases hot enough, there was no need for heavy blows on the shaft anyway.
The heat bit is important, as MZ employed quite heavy interference fits for both the bearings into the cases & the shafts into the bearings - just like SKF rceommend in their design manuals for reciprocationg loads. Designers who took note of supplier application recommendations - who would have thought that would happen ?
Forcing them apart (or together) cold damages the cases - doing it hot (120 C recommended IIRC) they don't offer much in the way of resistance & don't get damaged. Welding gloves help avoid operator damage !
I found out the hard way that the subtly modified re-assembly method in the ETZ250 manual is definately the way to go. The only difference is how the sprocket side output shaft bearing is fitted - the TS manual says to put it in the RH case half, whereas the ETZ manual recommends fitting it to the output shaft. The grip of the case on the bearing outer ring is greater than the inner ring grip on the shaft & when the sprocket is fitted, doing up the nut pulls the shaft up to it's shoulder through the bearing if it is fitted in the case first. This buggers up gear selection & required (in my case) a hollow drift making & the case warming up in the area around the output shaft bearing to move the bearing & shaft back into position. Bottoming the bearing on the shaft as per the later recommended assembly sequence would avoid having to do this.
Using a syringe sounds like a plan - maybe able to get in through the inlet manifold face with the piston at TDC - save lifting the cylinder ?