Chain? stock chain, probably not O-ring. Guess its time to replace it, I should have seen that coming with all the mods I've done lately.
If you are interested in enduro or hare scrambles, try
www.setra.org
If you happen to be like me, kinda slow and outa shape{!} try a hare scramble first
1 and 1/2 hour race, 7-15 mile course, no time keeping, he who finishes first wins [by class].
Enduros are a bit tougher, 50-115 miles, generally not over same spot twice! No jumps to speak of, but a real test of your riding [and pacing] ability. You should try one sometime. Sandlapper Enduro is in 2 weeks, I was actually able to finish without "houring out" that one {I always finish, even if the sweep crew is eating my dust!}
Our club has two members who are partners in a flat track in Neeses SC
www.midcarolinaspeedway.com Sometimes they have a "run what ya brung" night where knobbies are allowed.
I wouldnt mind trying flat track, but until there is a local track, my check book can relax!!
Robert