jetmoto 90cc upgrades????
 

My son has a jetmoto 90cc quad, and I have seen the 110cc uses the same frame and has an auto tranny with more than 1 gear. What all would I need to do this swap, e-bay has a motor and tranny for under 200.00 wich includes the carb cdi, do I need to buy a gear selector as well. And what other up-grades can I do the motor.