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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
shim shuffle - KTM WP forks
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[QUOTE="drehwurm, post: 24411, member: 20888"] Servus, I have a shim stack here, some ideas of how to change it and would like to get some comments from you guys. The bike is a 2001 KTM 520EXC with 43 WP USD forks and we are talking about a fast outdoor MX track. If the suspension works on this track, I also like it for enduro riding. Problems with forks (the rear PDS works surprisingly good): 1) severe headshake when braking hard over braking bumps and not being over the rear of the bike 2) deflecting off sharp edges when accelerating 3) bottoming 4) fork soft on LS-comp, but I don't want to go in to far on the comp-clickers - IMHO oil has to flow. Springs are balanced and seem fine to me. Shim stack: 24 x 0.1 2x 12 x 0.15 1x (crossover) 22 x 0.1 20 x 0.1 18 x 0.1 16 x 0.1 14 x 0.1 10 x 0.3 Ideas: 1) widen gap in middle of HSC-stack to get rid of the deflecting 2) add shims ( 12x0.1, 11x0.1 at end of HSC stack to stop bottoming 3) add 24x0.1 shim in LSC stack to make fork a little firmer and fight headshake Idea No. 1 has been realized with exchanging the 18x0.1 and 16x0.1 shims with a 19x0.1 and 17x0.1 shim. Oil level has been raised by 10mm to fight bottoming, but due to lack of shims idea no.2 and 3. could't be realized so far. The deflecting is gone, maybe also due to the change to Öhlins no.5 fork oil, but bottoming has increased (not surprisingly because of the weaker HSC). Next steps would be idea no.2 and 3. and I would like to hear comments on this one please. Michael * 2001 KTM 520EXC * [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
shim shuffle - KTM WP forks
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