@rx1one5
there are many factors involved to "altering" the engines, by just putting an over sized piston and clutch box of 135 you will not accomplish much. i can guarantee any stock 115 with a default engine will smoke your ride.
there are three stages (Stage1 , Stage2, Stage3) to altering any engine and just asking mechanic to alter an engine is not sufficient. you will have to explain to ur mechanic how and what to alter to get the performance.
Stage 1 : involves porting of the exhaust chamber
Stage 2 : combining Stage 1 and porting on expansion chamber
Stage 3 : combine both stage 1 and stage 2 along with performance exaust (free flow), bigger carbs, sprockets, iridium plugs, custom reed valves, tyers etc even low weight rims. Every bit matters
all the three stages are done with precision and through trial and error. but u go to any desi mechanic and say i want to alter my bike all they do is put bigger pistons and kill the engine even more.
u will have to do 80% mechanic work your self to "tweak" your ride.. it took me quite some time to understand this all and explain to my mechanic with whom we tested a few methods and managed to accomplish it. and in process ruined many cylinders and pistons.
just by putting an oversize piston and bigger clutch box with not give u a good result