Originally Posted by
Nitrovein
What expert recommends 65% for this type of engine?
Sorry for the late response - have been “out of town” for a while. Just sifted through my “balance folder” in the shop. Many of my references are from the motorcycle world. Found that b.f. recommendations tend to aggregate around 60-65% - provided we speak about a single cylinder engine, beam mounted in the upright position. So for my Enya mounted in the upright (or inverted) position I would aim for 65% if wolfram addition is to be made. Mounted sideways I would aim for 60%, not that it matters much in practical terms. Never measured the exact b.f. in the Saito.82 in post #107, just established that it was still “underbalanced” with reference to 65%.