I picked up this used 2008 specialized dirt jumper for $75... had some rust - but with some oil, grease and a new chain, I'm mostly in business.
The fork has me a bit stumped though - I removed the plastic top cap thinking I'd find an air valve - but that's not the case, it's just straight into the forks internals.
The other side has a metal cap with a + and - on the top - guessing preload adjustment?
Is this for non-air?
Is there any info anywhere on how to service this fork?