My son has a JR50 and the handlebars mount directly to the triple clamp with no adjustment. The setup is the same as a pw50. Anyway, my son is tall for his age and I want to raise the handlebars. Ideally I'd like to go with a conventional 7/8" bar setup but some sort of risers may be more inexpensive. Does anyone have any suggestions on the best way about converting to a taller setup?