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Canadian Daves JustKDX
Preload question for Fredette Fork Springs
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[QUOTE="tominator, post: 877404, member: 50418"] I ran into the same problem. I spoke to JF several times because the front end was too mushy when aiming for 10mm of preload. I also spoke to Mr. RaceTech. They don't see the world the same way. Jeff recommended using the stock preload spacers. This is about 30 mm of preload on my bike with FRP springs. It didn't work too good. The RaceTech website has a dirt bike suspension FAQ section that provides a table with recommended static sag ranges. On the front they recommend 65-75 mm. If you use this as a target and select say, 70 mm, it will get you close to where JF is talking about being. The preload is going to be higher than you may expect. Mine is about 18 mm. I screwed aroung with this about 2 months. I ride some MX and some tight rooty rutted gully trails. It has worked-out a lot better than I thought that it would (BTW, I used RT oil level recommendation and JF shim recommendation). In fact, the tuning recommendations that JF gave me for fast vs slow terrain are spot on. A lot of people say that my springs are too soft (0.40 for 190# rider per JF). I run my clickers from 6 (MX) to 16 (gully wash trails). My arms are never beat up. (I wish I could say that about my ass on the MX track. I guess I need to work on my shock some.) I fact, everyone that rides my bike says it's comfortable and controlable. I thought about getting 0.44 springs, but I rarely bottom on the track and it is comfortable so I didn't. There are some good engineering reasons why RaceTech recommends heavier srings. However, there is a lot to be said for experience in tuning the KDX. I can run wide open up a root filled gully in 3rd and steer the bike. I can also come up 3 feet short on a 30 ft table top (normal for me) at the track and not bite the cross bar. I hope that this helps. Tom [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Preload question for Fredette Fork Springs
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