Honda MF50FA 1980 (SWITSERLAND) (SW) Forum

Hi there!
I'm looking for some expertise and feedback regarding the unrestricted 80km/h model of MT50.

I'm trying to build a MT50 engine as they where originally launched in Japan. It's going well and I have been able to get almost every part directly from Japan (used parts).
Many parts are the same as the first model that was launched in Switzerland 1980. I have a parts catalog for the Japan model and I can diff the article numbers against cmsnl.com.
(Just let me know if you need any info and I'll look it up for you)

The MT50 that was launched in Japan was named MT50Z.
It had the following cylinder: 12110-167-000 Comp. A
It is the same (regarding to cmsnl) as Swizz 1980 up to serial 5014606.
After that serial they exchanged the cylinder to nr. 12110-167-010. They also seemed to get down on the carburator jet which indicates that the cylinder has lower power(?).

Summary
There seem to be two versions of the Swizz 1980 model, upto serial number: 5014606 and from serial number: 5014607.

Are they both 80km/h versions and are the performing equally?
Can anyone confirm that the cylinders are different and 12110-167-010 is a weaker variant of 12110-167-000?

Kind regards and thanks in advance,
Olle from Sweden