Hi all,

I found out I have a stiff chain link today and I'm not sure how to go about fixing it. Firstly, should I try cleaning my chain first? When I touch the chain I get black oil on my hands and I'm not sure if it's dirt or just some kind of black chain oil Secondly, I searched the web a bit and some websites say using a chain link tool will fix it but I don't have one. I was also wondering how do chain links become stiff?

I'm a newbie so please bear with me!