Buy a Gary Denton stabilizer. The PEP's work, but they are weak compared to the Denton, especially since the price went up on them. I had a PEP on my 300EX (that I paid $99 for, now they are $129) and it was sufficient, but the non-rebuildable Denton is much more serious. More adjustments, and just better built. The 3 adjustments on the PEP is a real joke. If you call Denton Racing directly, they will sell it to you for $125. The more expensive rebuildable Denton, just doesn't fit on a Z400. They claim it fits, but a buddy ended up sending it back for the less expensive, non-rebuildable model.
It keeps the bars from trying to snap out of your hands in the rough stuff. It is like a shock absorber for for the steering stem. I believe it is one of the best mods for the $. You won't get arm-pump as easy cause you don't have to hang on as tight.
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