need new sprockets and chain for my new to me 09 kx250f. The bike has an o ring chain on it now. I'm wondering if that is stock or something the previous owner put on. Curious if you guys have any opinions on mx or o ring chain. this bike is kind of a track only, test the 250f waters kind of bike. I have Husky cr 144 set up for woods that is kind of my main ride. I've just been running cheap mx chains on that. I've always kind of been a run cheap chain and sprocckets and change often kind of guy.