Loud clunk from front forks, also finished the paint job finally!

[Chiller449]

Hey guys,
So I’ve had a cluck coming from my front forks for a while now. They hold air pressure, I have it at about 17psi currently. It seems whenever I hit a bump my forks extend out too far and bottom out resulting it a loud clunk. I don’t think they are compressing all the way. Just extending too far. Would the fork seals be bad if it’s still holding air? Or is there something else I should check first? I have no idea if it has oil in it. Maybe that’s the problem? Also I just finished the paint job yesterday. Got a little touch up to do but I don’t think it’s too bad. Went with an army theme. Wrapping the exhaust next week. Check out the pic. More to come. (Pic attached)

[WingAdmin]

If you are low (or have no) oil, this will occur. The oil flows through restricted orifices to slow down (damp) the movement of the fork tube. If there is not enough oil to cover those orifices, the fork will extend with a bang, like you are experiencing. That's the first thing I would check.

[Chiller449]

How do I go about checking the oil and adding some? Never rebuilt front forks before. Also what type oil does it take?