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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
02 KTM520SX - Playing with valving (part 2)
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[QUOTE="Bud-Man, post: 589315, member: 20830"] Yoken, I think you are on the right track with what you are doing. I think you will have the best performance using the MV compression with a low lift value, like whatyou are using (.20mm~.30mm). I'm a little confused on the 10.5 spacer on the bottom of the MV compression stack. Did you make this spacer or is it a typo? Is there another shim below this, such as a base plate or is the spring acting on the larger diameter shims? Just curious. Definetly try experimenting with a non independent crossover setup on the BV, such as 16 or 17mm diameter. You will need to reduce the number or even the diameter of some shims in the 1st stage stack as the larger diameter crossover shimm increases the strength of the first stack. A very common primary stack is: 24.10 20.10 16.10 With a lot of MV compression in the mix you will need to reduce the strength of the BV or the forks will start to feel harsh. (As you have noticed) In your initial tests the large crossover gap softened the BV enough to give decent plushness but it also reduced the lowspeed compression necessary for good control. I think this is where the non-independent stack has it's strengths. Done correctly, it can give you the best of both worlds. On another note, you should really look into the springs in the forks. If the rate is really far off for your weight and intended use, you will wind up chasing your tale with the valving. Also, check how much preload is on the springs. I've notice that large bore 4-strokes like a good bit of preload on them. On my own '01 520 SX, I've had good success with as much as 15mm of preload. Good luck and keep us posted! [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
02 KTM520SX - Playing with valving (part 2)
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