Must be another difference with the Aussie KDX250F Zero preload for my forks is 455mm, no surprise other differences include different primary drive ratio, some gear ratios,balancer shaft, steel tank, oil injection (the reason I'm keeping it), steering column lock and no exhaust port timing valve just the drum valves which leaves the bottom end a bit weak but I fixed that with a Gas Gas 300 piston.glad2ride said:If the stock springs fit with no preload, then it may very well be time to replace them.
The 997 series Eibach springs, which are no longer made by them, gave 10mm of preload with no spacers installed. The distance inside the forks from the top of the cartridge seal head to the bottom of the fork cap is 490mm. The 997 Eibach springs are 500 mm. 10mm is the recommended amount by Race Tech. The currently available springs are around 484mm, or so, requiring a spacer to be installed (along with the spring guides being modified to have a smaller outer diameter. As the fork spring rate increases, two variables do not change. The length stays the same. The outer diameter stays the same. The thickness of the coil wire gets larger, which in combination with the outer diameter staying fixed, the springs inner diameter shrinks, rubbing against the fork spring guides. They are $10.something each at www.ronayers.com, so if you are tinkering and do not want to mess up the one current set you own, a new set can be purchased, then the old set modified. I used a bench grinder, then hand file, then sandpaper on the set I modified.
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