The handlebars can be raised but the cables generally should or need to be replaced for longer ones. Anything up to 4″ tall handlebars will work without any changes to the cables. If you reroute the lines and cables, you can generally get closer to 6-7″ tall handlebars. Usually the cables are crossed under the tank which reduces the length of the cables too, if you uncross them you can get a little more length. If you go 8″ tall or above you will need longer cables and wiring.
Extended Cables #
Some retailers that sell extended cables for the Yamaha Bolt.