Many thanks Chuckauger for you informative overview.
1) Nice job and I´m happy to see the "balance factor" now being defined as the whole assembly but half the weight of the big end of the rod. I will certainly dismantle some of my modified 2-strokes to see where I ended up in my effort to take away as much as I dared on the crankpin end.
2) rsieminski commented on your nice "scoop" and it sure looks good with some further grinding just below the crankpin to facilitate breathing. Nice job which will certainly inspire me to go further in my own modifications.
Attach a photo I saw in a german magazine showing the grinding of a Rossi crankshaft. Comments..??
3) Chuckauger(or anyone else) do you know if the "balance factor" as described by you and Scott Newkirk above also does apply to a 4-stroke engine..??
4) w8ye suggested Pteracodyl do a rcuniverse search on engine balancing. Well, I tried that but did not find much beyond this thread.....my fault maybe...??
hope to hear more from you all...........Cheers/Harald