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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
PDS shock workings and history.
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[QUOTE="marcusgunby, post: 640150, member: 17066"] Close but no cigar:) the main problem tuners have found is when the shock works at very high shaft speeds the oil cannot bypass the bottoming piston , so the oil actually opens up the shim stack on the bottoming piston during the part of the travel where it should play no part. So on low speed movements we are dealing with one piston, on high speed it actually has both pistons working all the time.This does cause a spike feel and a big kick under breaking bumps, so you valve it softer and now it feels all mushy on slow shaft speeds.Its like a moving target.I proved this by removing the shims on the bottoming piston-it felt very different to ride even when going fairly slow. Now i forgot to say before, the shock also uses a 18mm shaft-the ohlins uses a 16mm so that makes a difference in how they feel, as the WP displaces more fluid through the compression adjuster.I know not just jer has been modifying the olders compression adjusters by drilling out the ports slightly.The new comp adjuster from what ive heard is a better design and doesnt need modifying. We could talk about the nitrogen bladder vs piston setup next-i know KTM talk loves that topic:) [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
PDS shock workings and history.
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