The Evo two speed transmission is not only a marvel for being the first in the industry. It is also reliable, easy to maintain and relatively easy to understand (in comparison with complicated CVTs found on larger scooters). This guide will show you a few modifications that can be made to both improve the performance of the transmission and lengthen the lifespan of the mechanisms. No modification will replace preventative maintenance. For suggested preventative maintenance, see Evo two speed transmission maintenance.