Yes. The preload actuator for the rear spring is hydraulically activated via an electric motor, which is what you hear running when you are pressing the up/down buttons. The problem is they are generally not full of fluid and have lots of air in them. Just like brake lines that have air in them and feel real mushy and lots of lever travel, the electric motor first has to compress all the air and get the line firmed up before any preload starts to happen. This is a strong spring. Any amount of air takes a lot of compression before the whole system is firm enough to start moving the spring. Place your bike on the center stand. Run the preload down to 0 on the meter panel, with the engine off so you can hear start running up the preload. For most people your hear the electric motor turn easily from 0 to 5 range. Then suddenly at 6 you hear the electric motor load down and start to move the spring. This means you really didn't have preload range from 0 -25. You really had 0-20, as the first 5 preload motor steps was just compressing air. So by filling the system with 5 wt suspension fluid and getting it topped off real nice, most find the preload engages almost immediately and you have a true 0-25 preload adjustment range.
2005 GL1800ABS 62,000mi
2003 ZG1000 133,000mi