Te mortuo heres tibi sim?
Join Date: Aug 2004
Location: East coast
Bikes: hardtail, squishy, fixed roadie, fixed crosser
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What cmdr said.
Specifically, you will need pages 54-55.
It's not hard if you've got decent tools and are halfway mechanically inclined.
FYI: you don't need to remove the lowers to do this - it's pretty easy to do it all with the fork nice and level. If you don't have the right size metric wrenches for the topcap and bottom nut, you can use a good adjustable wrench, but be careful/go slowly so as not to mank them up - they are fairly soft alloy.
After letting all the air out, remove the top cap. Undo the bottom nut, leaving it just halfway on the lower air shaft. Tap that whole thing with a rubber mallet to bust it loose from its internal seating. Remove the nut the rest of the way, making sure to get the washer off. You can then push/pull the whole air assembly (well, at least the parts you need to mess with) out from the top. From their, follow the directions from SRAM as to what spacer to remove. Then reassamble. Make sure to replace any oil you lose. The air side uses very little - just enough to lubricate things in the lowers/seals, and the positive and negative air chambers.