gary55
Well-Known Member
I couldn't agree with you more. I'm trying to wrap my brain around all the variations of components used in these engines, but I'm not there yet.I hate to make universal statements about these motors, as one never knows do one, but it would seem that most A80s are 40mm stroke & 40mm rods while most PK80s are 40mm stroke & 38mm rod.
As rule of thumb from outside of motor, I note that a bit of extra vibration at low speed and a bit more low end torque seems to indicate the motor is the short rod type.
Only opening it up and measuring center to center on rod bearings would tell for sure.