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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Progressive Suspension Fork Springs
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[QUOTE="glad2ride, post: 1380362, member: 62076"] I suggest you do not do it. Almost all suspension tuners go with straight rate springs for off-raod bikes. Is 170 pounds your weight with all riding gear, toolbagm water backpack, toolbag on bike, etc.? What is your skill level, riding terrain, racing or putting along with the kids, etc.? A .42 or .44 Kg/mm rate spring is probably going to be what will work best for you. This will sound odd, but it is the best way I have found to go on the 1991 - 1994 KDX250 fork springs. Buy some RT 3949 or Eibach fork springs. They are the ones for the 1993 - 1995 KX125 and KX250. You will probably need to file, grind, sand or lathe down the outer diameter of the white, plastic fork spring guides that fit inside the springs. Stiffer springs have larger diameter coils. The fork tube diameter prevents the spring from being made larger in outer diameter. The outer diameter must remain the same. Therefore, the coils are larger to the inside of the spring. You will also need a spacer to make up the distance from the top of the spring to the underside of the fork cap. The reason for this is that the new fork spring is not long enough. For example, the Race Tech 3949 springs are 487mm long. A 13mm long spacer (1 1/4" PVC pipe) will make the spring and spacer combo length equal 500mm. This will give 10mm of fork spring preload, which is what Race Tech recommends. When Eibach was still making their 997 model of fork springs, it was 500mm in length. It was marketed for the 1991 - 1994 KDX250. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Progressive Suspension Fork Springs
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