Re: Curious about the engine, :question:
Another thing I noticed about the engine I have that has the ZAE50 rod is that the threads in the case are fine threads and the top of the studs are coarse threads like the typical PK-80 engines, I also have an old BGF ngine that has studs that are this way, I biought that BGF engine back in 2010, it has the low pin piston but I have no idea what crank it has, been to long since I've seen it.
Another thought that just came to mind is this, if you look at the lower rod journal pin on both of the cranks, does the bottom edge of the pin come closer to cranks main shaft on one than the other?
Here is a pic I just took of the extra ZAE50 crank I have.
I dont always ride WOT, but when I do..I do my best to keep the rubber side down..Ride safely my friends!