ORIGINAL: jetmech05
OS I believe...I ran one for a few years
Eh, the Tower Branded engines were made by the same factory that produce the GMS and some of the SuperTigre engines.
These are Chinese engines, I believe the O.S. are Japanese made.
The GMS and Tower engine parts are and were interchangeable.
K&B used to stock parts for the GMS engines that I often used on the Tower engines.