Yes, the ZX-14 has long, soft top-out springs in the front fork, and that does make it difficult to set sag properly. Originally, top-out springs were intended to provide a soft buffer for the fork to fully extend against when - for example - the front wheel came off the ground. But over the last few years, other advantages have been found by using long, soft top-out springs in both the fork and shock. The chart shows how the overall spring rate in a fork is affected by the addition of a top-out spring. The rate near full extension changes as the top-out spring compresses, effectively working against the main spring's extension. The advantage can be seen here: with a conventional setup, it takes a significant amount of force (20kg in our example) to compress the fork at all. This means that as you accelerate out of a corner, if there is less than 40kg of weight on your front wheel (20kg on each fork tube) the suspension won't budge. This leads to the front end skipping over bumps and potentially causing headshake. A fork with long top-out springs will move with any force applied at all, making it much more compliant over small bumps accelerating out of corners.