Whats the Difference
 

I was wondering the differences between the 12a motors which is what i have and the 13B motors? Anyone have a good explanation of the differences?

Well, the main difference is that the 12A is a 1.1 litre engine and the 13B is a 1.3 litre engine. To make it a 1.3, the rotors are 10MM wider then the 12A and thus the eccentric shaft is longer and the rotor housings are thicker.

Thank you for explaining that for me.

emphasis on engine :p not motor? lol

LOL hahaha yeah i noticed