I just read in the Hustler forum where a gentleman had purchased a new Super Z with the 35 Kawasaki and was claiming the throttle lever was backing off, this is his question: "My SZ with the 35 HP Kawi throttle lever keeps backing off from full throttle to about 3/4 while I'm mowing. Can this be tightened under the instrument panel?" You would think this to be impossible when thinking about the length of time Hustler has been installing the Kawasaki FX1000V on their Hustler Super Z. The reason I say this is for the fact this is not an isolated incident, this is what "hustlermidwest" posted: "Yes, but I need to know the serial number. There was a SB on this issue." Now, think about this for a minute, they have installed thousands of these engines on their Super Z mowers, now, all of a sudden they've either forgotten the procedure for the throttle install, or there has been a difference in parts supplied...Which would any of you believe it to be??? I personally find it unbelievable something this simple could get by their quality control once, much less to the point so many have gotten out of their manufacturing facility they need to issue a service bulletin. You work, work, work on a mower in R&D to make sure it is problem free, and then let something this simple take place to the point of requiring a service bulletin...come on, let's get realistic.