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Dirt Bike Mods & Maintenance
shim shuffle - KTM WP forks Part 2
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[QUOTE="drehwurm, post: 69793, member: 20888"] Servus, This is the sequel to the thread 'shim shuffle - KTM WP forks' with new experiences,ideas and questions. For reference and starting points see part #1 under [url="http://dirtrider.net/ubb2/Forum24/HTML/001153.html"]http://dirtrider.net/ubb2/Forum24/HTML/001153.html[/url] DISCLAIMER: Do not attempt to use any of the following as suggestion or even advice to setup your own suspension. This could be dangerous and lead to serious unhappiness with your forks. Just take this as what it is: the irrelevant babble of a curious Austrian. While waiting on my shims to arrive an Öhlins PDS shock from MH-Racing (thanks Mark) found the way onto my KTM – an investment worth any penny! But while the Öhlins is a great improvement over the 'not so bad' stock WP shock, the problems of the fork still persisted. Finally my shims arrived and in a last minute decision I decided to use the following stack # 1: 24x0.1 3x (plus one) 12x0.15 22x0.1 20x0.1 19x0.1 17x0.1 14x0.1 13x0.1 new 12x0.1 new 11x0.1 new 18x0.3 base plate and an oil level of 140mm. Note, that the overall height of the stack remains unchanged (13,12,11x0.1 replace stock 10x0.3 clamping shim) The difference was amazing, but not in the way I expected it too be. .) Bottoming from large jumps was reduced, but not as I had hoped. Still, this is not surprising as it has been stated before on this forum, that this type of bottoming is more a midspeed thing. Do I have to modify the midvalve now? .) Headshake was unaffected and still there so I just installed my Scotts and forgot about it. This thing (Scotts steering damper) should be considered as 'live saving' equipment on KTMs !!! I was able to reduce headshake to a minimum with very fast rebound settings or lots of static sag, but both of this actions caused other way more negative effects. .) On the positive side, the bike was much more stable now. I could go straight through the worst acceleration and braking bumps or little whoops where before I was fighting the bike to go straight. There was no deflecting, but the ride was tiring. Great setup for plain MX-use and a probably slightly heavier rider. All in all I liked the way the bike handled now, just a tad too much HSC for my general purpose use. Nevertheless, I was in 'experiment' mode and wanted to know if the increase in diameter on the clamping shim from 10mm to 11mm made such a difference or if it was the increased HSC. Easy enough, I left the stack like it was and just added the 'old' 10x0.3 clamping shim on the bottom. This is the stack #2 I tried the next day on the same course, almost same conditions: 24x0.1 3x 12x0.15 22x0.1 20x0.1 19x0.1 17x0.1 14x0.1 13x0.1 12x0.1 11x0.1 10x0.3 new 18x0.3 base plate Holy s**t, what a difference. The bike almost felt like at the start. Pleasant and nice, but unstable and hard bottoming. I had to go in on the comp clickers from 12 before (stack #1) to 6 come at least into the range of the lap times with stack #1. Well, I need some explanations! This 10x0.3 shim made so much difference, but why? Is the increase in overall height (the shims can bend more till they hit the base plate) or the reduced diameter (from 11mm to 10mm) responsible – or is it a combination of both??? Is this actually a 3-stage valving with the base plate being a SHSC (super high speed comp) 1-shim shim stack? At least I know now WHERE I want to be – somewhere between stack #1 and #2. Ideas include a thinner (0.1 or 0.15) 10mm clamping shim or a thicker (0.15 or 0.20) 11mm clamping shim. As I only have a 11x0.15 at hand right now stack #3 will look like this: 24x0.1 3x 14x0.15 a little more LSC still 22x0.1 20x0.1 18x0.1 a little less LSC to compensate for the 11mm clamping diameter 16x0.1 ditto 14x0.1 13x0.1 12x0.1 11x0.1 11x0.1 makes for 11x0.2 18x0.3 base plate Michael ------------------ [/QUOTE]
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shim shuffle - KTM WP forks Part 2
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