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Message: [QUOTE="jimt_yz400, post: 1120002, member: 21081"] I did replace the bottom seal in the cartridge and this did help, but what I ran into was a bad seal in the compression assembly. The one behind/inside of the bushing. You can order these from MX-TECH, they are 12x17mm. The sympton was when installing the compression assy then stroking the dampening rod up and down into it's full movement, most of the oil would be displaced out of the bleed holes in the cartridge housing. This would cause air to enter and cause a vaccuum. It would also cause the forks, when riding, to feel initially soft but becoming hard in the mid stroke due to an increased oil level in the outside chamber. The same sympton is experienced when the oil escapes past the lower cartridge rod seal. Changing both made the forks feel "like new". I'm surprised that no one has run into the compresson assy seal failure. In the past two weeks I'm run into 3 forks with this sympton. Cheers! [/QUOTE]