derestrict the bike from the clutch and variator or simply change to performance parts, also bigger carb, chacnge the reeds and manifolds, maybe a performance exhaust, if u wna make it sound better i suggest a stage 6 exhuast with a 70cc kit and an aftermarket air filter, with all that maybe change the crank and you could get that bike hitting 80mph
yamaha magic
July 2012