Front forks help

Ive got Marzocchi Dirt Jumper 2 100mm w/20mm Dropouts forks on my Kona Hoss and there a bit soft and i want to stiffen them, Theres a car valve adjustment on the right fork, What do you pump the forks up with and does that stiffen them? Theres also a capped bolt under the right fork, What is it for?
On the Left fork theres a Allen key bolt under the left fork, What is it for?
On the Left fork theres a Allen key bolt under the left fork, What is it for?
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max 15psi.
rebound.
downloading the manual would be a good idea.
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For 15psi would it matter?
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