RE: Convert a Dolmar/Sachs 40cc chainsaw engine
Dave,
Here is a pic of the rod, crankshaft, and the twelve rollers that make up the lower rod bearing. It might be possible to put the bearing on the front. It could be installed in the plate that also would carry the timing ring. The crank even has a shoulder on it that the bearing could ride against. The smaller portion of the crank measures .500 so a bearing should be easy to find.
Dean