I don't know what other people think on this subject, but here are my thoughts. I don't want the bearings to be a press fit on the crank in this type of motor. I have actually put new cranks in the lathe and polished them down so that they are a very snug fit in the bearings, and not a press fit. Here's my logic. When the aluminum cases heat up, they expand at a different rate than the steel crank. The right side of the crank is tight in the bearing because of the nut tightened on the end. The left side of the crank should be free to float in the bearing, so as not to cause a bind in the bearings due to different rates of thermal expansion. In my opinion, if it takes both hands, and most of the strength of your fingers to get it together, that's just right. In theory, this should free up a very minute amount of horsepower. It also makes the motor easier to assemble and disassemble. Again, this is my theory and experience. It's your motor, you decide.
