[sportrider - latest stories] - Ask the Geek: Fork Top-Out Springs

[Ninjette Newsbot]

Ask the Geek: Fork Top-Out Springs

Your abnormal guide to things abnormalI recently purchased a 2008 ZX-14. I had no problems getting the shock set up but when it came to adjusting the fork I was completely puzzled by the results I was getting. By running the adjusters through the extremes of adjustment my useable range of sag was between 42mm and 56mm. Typically, I set sag to 30mm front and rear. I have set sag on the numerous sportbikes I have owned over the past 26 years and have never encountered anything like this. I searched the Internet and the only real information I found was on Race Tech's site. The info leads me to believe I have encountered what's known as "top-out" springs. I have read the Race Tech tip "Sport Bike Relaxed Preload" but it is still unclear to me how I go about setting up fork sag properly on this bike. Race Tech says the bike has a long top-out spring and "this requires 20mm relaxed preload minimum". Does this mean I just deduct 20mm from my calculations to get the correct sag? I am not sure how to go about setting the fork sag on this particular bike, could you enlighten me?
Dan Forest
Goffstown, NH



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