Maybe some small adjustments would do. I cant explain it verry good in english. Change that thing in the fuel intake that does the spark. Put one with better performance. Do some weight redumption. That is, try to loose some weight, lighter rimms, somme trimmying, the middle stand if you dont use it. But you will notice little effects this way, only in the aceleration maybe and the bike maybe would get ugly. Try to ask a person who works with mechanics, bikes and stuff. Ask him to adjust the carburator for higher performance and to disregard fuel economy... Thats always unnavoidable. Higher performance, higher fuel consumption. Hope I have helped.