^^^Than it will be a head ach!!!!! Stock Yamaha 100 Tires and breaks suck big time to control the bike with this 100 CC and you are talking of getting a more powerfull engine ----- lol.
Contact RX115 (Faheem page 1) in your area he is the right person in you surrounding.
ask faheem to get you Rx115 or 135 in good condition with a budget of 50K-60K.
Screwing this Yamaha 100 will not help your plans of flying.
Also tell us your budget will suggess you good in it.