Ben,
If you e-mail me on this site (Spare Parts) I will forward you a parts list which shows you most of the details.
The mixture is 25 to 1 for the twin.
It only has the one carby,coil & muffler.
The mower to my knowledge was only use as a push mower as they had a slight problem with one cylinder running hotter than the other.
Hope that this is of some help to you.
Regards,
Bruce