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Dirt Bike Mods & Maintenance
Problem with shock's valve stack
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[QUOTE="PedroMx, post: 396930, member: 21330"] Thanks a lot guys for taking your time to answer. I will use more of your knowledge if you let me. As you see I am no expert but now I intend to become one, this thing is fascinating me. The needle is indeed very hard to move and the cone in its tip is somewhat deformed, I thought that the o-ring on its base was too tight. There is a checkvalve on the nut end of the rod, is operating free under compressed air but I don´t know at how much pressure it should open. I reassembled the shock taking away 2 shims as you indicated following the directions Mr. Wilkey gave some time ago. The rod was really hard to stroke while bleeding it and, to assure that the needle was free I disassembled the rebound adjuster and I saw the needle moving slow but free (I did not let it pass the point where it would let oil flow out). Nitrogen is set at 15 kg/cm2. Compression worked well, tested on a 50ft double OK and on braking bumps OK, but packing is present. Regarding the piston being upside down, this is what i see, the piston has two sets of passages one set larger than the other, I assume the larger are the compression ones. The piston has two faces in which the passages are unrestricted and also forming the base of a valve where the first shim seals the passages. It is mounted this way, the big holes will let oil pass on compression and will not on rebound (sealed by the first shim on the comp stack). Thanks, and again excuse any butchering to the language. I want to learn but my vacations are really short... Pedro :) [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Problem with shock's valve stack
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