The post said "two ball bearings on both sides of the crank throws"..Two on the front is a very good idea, makes the crank more rigid, just like a cantilever, as the hub is almost next to the front bearing..Two on the rear is maybe overkill, but if the crank is PERFECTLY straight and concentric it could be the reason for the alleged smoothness of the engine..I'm working on a 62cc Zenoah converted INDUSTRIAL engine, not a chainsaw, that comes from Zenoah with two bearings on the front and one in the rear..Should be smoother than the G62 because of the close proximity of the front bearing to the prop hub..The only common parts between the G62 and this one are the bearings and seals..Should weigh about 4 and 1/2 lbs and will have electronic ignition with electronic advance..Looks good so far, ignition in the square rear crankcase casting...