Yeah, you take off the allen bolt holding the bar end weight. Take off 2 allen bolt holding the enclosure that hold the throttle tube and cable in place on the handle bar. The cables comes off by sliding through the hole in the tube. The whole tube comes off and on goes the new tube. Be sure to lube the new tube. Do the reverse of above and you're done. Adjust cable slack afterward.
Only pain in the ass part was, if you want to keep the grip the same on both side you need to slide the grip off the old tube and swap with the new. took it off with a chopstick and some water. I slide the chop stick in rotate the chop stick and the chopstick will work its way around the tube separating it from the tube while doing that drip water in between the gap between the tube and grip created by the chopstick. once there's plenty of water in there. Grab a towel to grab the plastic end of the tube and grab the grip with the other hand, a good pull and they'll come right out.