06-22-2012, 08:13 PM
The motor is a v-twin flathead similar to what you see in today's modern Harley-Davidson. Both connecting rods ride on a common crankpin that spins between two flywheels. These flywheels turn on 2 pins called a drive & and a pinion pin. The whole thing is bolted together and before assembled in the cases need to be true in a truing stand. The same as putting a shaft on centers in a lathe. The shafts are the persuaded to run true with a lead hammer. Hopefully this explains what's going on.