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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
New KDX250 rider, restoration.
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[QUOTE="glad2ride, post: 1351399, member: 62076"] You are welcome. The stock springs are too soft, even for you at 150 pounds. Race Tech recommends a .406 (closer to .40 Kg/mm rate). In the early 90's, it seems that softer springs and stiffer valving was the norm. Modern thinking is using a stiffer spring. It will keep the forks higher in the stroke and not allow them to sag so much. If you have not changed the fork oil, I assume it is very old and worn out. Otherwise, the bushings may be worn out, or a tube slightly bent, etc. which would cause binding, keeping them from working as they should. Your current forks, or any KX forks you fit, will need a full rebuild to work as they were designed, as they will be around 15 years old. That many years of use in a harsh off-road environment causes the internal parts to wear out. A set of MX forks will not be valved (tuned) for rocks, roots, ruts and such, since those are not on a MX track. You probably won't be doing any big doubles or sky jumps out on the trail either. The KX forks may come with a spring rate that is closer to what you need. Having adjustable rebound is not something to consider a huge plus compared to having the correct spring rate. You may want to look at the parts diagrams on the Kawasaki site. I think the brakes are the same on 1991 KX's, but then may have changed (at least part numbers) the next year. I am not sure if the newer year brakes mount the same or not. You might be able to swap some parts around to make it work. (this caliper mount, that caliper, this hose, etc.) Where the axle mounts to the forks, there is a big difference in the mounting style, axle diameter, etc.. which requires the use of the KX axle (and wheel) to keep things simple. One could have an axle made at a machine shop, but that goes beyond "simple bolt-on" in my opinion. One could have any part made, but the cost is a lot different than hopping on eBay and buying used parts. If you go with the KX forks and wheel, the tripmeter / odometer drive won't work with them, if that is something you need. If you decide to get KDX or KX forks rebuilt, revalved for your weight and riding style, plus buy the correct rate springs, (kind of an "all things being equal" and functioning as they should), the KX forks will be more modern and are technically capable of a higher state of tune due to the internal construction with more advanced parts, R&D applied, etc. Look around on the internet for pictures on how the KX wheel mounts, if it is not making sense as to why it won't work. Again, congratulations on the bike. If you have a few more pictures, please post them. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
New KDX250 rider, restoration.
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