Dynamic Prop balancing is available to ALL prop driven aircraft, Microlites, etc. Don't let anyone tell you different, a well balanced prop makes a world of difference, in terms of airspeed for a given power setting, reduced component wear (cracked manifolds, panels and cowlings, not to mention heavy engine wear)
A small % of lycomings cannot be balanced, but this depends on whether the aircraft has suffered a tip strike at any time and then had the same crankshaft re-fitted. The fact that said crank passes bench concentricity checks, or output flange trueness checks is irrelevant.
If you want to know more about it, and who will do it contact Andrew Brinkley, Brinkley Aircraft Services, Meppershall Airfield, Cambs, he has a very good guy who does his planes. Alternatively pm me, I have a contact.