Re: cables for hi rise handlebars
You can always make your own throttle cable.
Buy a long length of brake cable at the bike shop, and cut to desired length, make sure to cut the end with the smaller end and keep the bigger end for your throttle assembly.
For the end that goes into the carb slide, you can heat it up with a propane torch, apply a light coating of solder then wrap some thin copper wire, and apply more solder until you get the right blob size that fits in the slide.
If its too big you can always file it down.
hope this helps